fix building of QtWebEngine in Qt5-5.10.1-intel-2018a.eb (WIP)

[boegel]

requires #7005 (NSS, NSPR, DBus) (+ easybuilders/easybuild-easyblocks#1544, strictly speaking)

Still WIP since the installation currently fails with a spurious undefined reference error that I haven't figured out yet...

The patch is already sort of a sign of trouble though, since building with Intel compilers is clearly not (well) supported...

[boegel]

Trying to get some feedback on this via https://bugreports.qt.io/browse/QTBUG-71129...

[boegelbot]

Travis test report: 7/7 runs failed - see https://travis-ci.org/easybuilders/easybuild-easyconfigs/builds/440776534

Only showing partial log for 1st failed test suite run 11244.1;
full log at https://travis-ci.org/easybuilders/easybuild-easyconfigs/jobs/440776535

...
ERROR: Check whether any conflicts occur in software dependency graphs.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 152, in test_conflicts
    self.process_all_easyconfigs()
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 122, in process_all_easyconfigs
    self.ordered_specs = resolve_dependencies(self.parsed_easyconfigs, modules_tool(), retain_all_deps=True)
  File "/home/travis/virtualenv/python2.6.9/lib/python2.6/site-packages/easybuild_framework-3.7.1.dev0-py2.6.egg/easybuild/tools/robot.py", line 376, in resolve_dependencies
    raise EasyBuildError("Irresolvable dependencies encountered: %s", ', '.join(irresolvable_mods))
EasyBuildError: 'Irresolvable dependencies encountered: NSS/3.39-intel-2018a, DBus/1.13.6-intel-2018a'

======================================================================
ERROR: Unit test that builds a full dependency graph.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 133, in test_dep_graph
    self.process_all_easyconfigs()
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 122, in process_all_easyconfigs
    self.ordered_specs = resolve_dependencies(self.parsed_easyconfigs, modules_tool(), retain_all_deps=True)
  File "/home/travis/virtualenv/python2.6.9/lib/python2.6/site-packages/easybuild_framework-3.7.1.dev0-py2.6.egg/easybuild/tools/robot.py", line 376, in resolve_dependencies
    raise EasyBuildError("Irresolvable dependencies encountered: %s", ', '.join(irresolvable_mods))
EasyBuildError: 'Irresolvable dependencies encountered: NSS/3.39-intel-2018a, DBus/1.13.6-intel-2018a'

======================================================================
ERROR: test_dep_versions_per_toolchain_generation (test.easyconfigs.easyconfigs.EasyConfigTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 164, in test_dep_versions_per_toolchain_generation
    self.process_all_easyconfigs()
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 122, in process_all_easyconfigs
    self.ordered_specs = resolve_dependencies(self.parsed_easyconfigs, modules_tool(), retain_all_deps=True)
  File "/home/travis/virtualenv/python2.6.9/lib/python2.6/site-packages/easybuild_framework-3.7.1.dev0-py2.6.egg/easybuild/tools/robot.py", line 376, in resolve_dependencies
    raise EasyBuildError("Irresolvable dependencies encountered: %s", ', '.join(irresolvable_mods))
EasyBuildError: 'Irresolvable dependencies encountered: NSS/3.39-intel-2018a, DBus/1.13.6-intel-2018a'

======================================================================
ERROR: Make sure specified sanity check paths adher to the requirements.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 305, in test_sanity_check_paths
    self.process_all_easyconfigs()
  File "/home/travis/build/easybuilders/easybuild-easyconfigs/test/easyconfigs/easyconfigs.py", line 122, in process_all_easyconfigs
    self.ordered_specs = resolve_dependencies(self.parsed_easyconfigs, modules_tool(), retain_all_deps=True)
  File "/home/travis/virtualenv/python2.6.9/lib/python2.6/site-packages/easybuild_framework-3.7.1.dev0-py2.6.egg/easybuild/tools/robot.py", line 376, in resolve_dependencies
    raise EasyBuildError("Irresolvable dependencies encountered: %s", ', '.join(irresolvable_mods))
EasyBuildError: 'Irresolvable dependencies encountered: NSS/3.39-intel-2018a, DBus/1.13.6-intel-2018a'

----------------------------------------------------------------------
Ran 9782 tests in 326.386s

FAILED (errors=4)
ERROR: Not all tests were successful.

• 11244.2 - errored => https://travis-ci.org/easybuilders/easybuild-easyconfigs/jobs/440776536
• 11244.3 - errored => https://travis-ci.org/easybuilders/easybuild-easyconfigs/jobs/440776537
• 11244.4 - errored => https://travis-ci.org/easybuilders/easybuild-easyconfigs/jobs/440776538
• 11244.5 - errored => https://travis-ci.org/easybuilders/easybuild-easyconfigs/jobs/440776539
• 11244.6 - errored => https://travis-ci.org/easybuilders/easybuild-easyconfigs/jobs/440776540
• 11244.7 - errored => https://travis-ci.org/easybuilders/easybuild-easyconfigs/jobs/440776541

(bleep, bloop, I'm just a bot, please talk to my owner @boegel if you notice you me acting stupid)

[boegel]

Test report by @boegel
FAILED
Build succeeded for 0 out of 1 (1 easyconfigs in this PR)
node3159.skitty.os - Linux centos linux 7.5.1804, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz, Python 2.7.5
See https://gist.github.com/5b6d11ab75ec74c0a77f836ddfea3010 for a full test report.

[boegel]

Not planning to spend more time to try and fix this, since we pulled down Qt5 to GCCcore...