clean up configure options that are now handled by R easyblock

[boegel]

The R easyblock has been updated in develop to automatically add configure options based on dependencies, see:

• correctly configure R for BLAS/LAPACK & check configure output easybuild-easyblocks#1292
• make R easyblock set configure options for dependencies easybuild-easyblocks#1297
• maintain backward compatibility in R easyblock by hard linking with $LIBBLAS (for now) easybuild-easyblocks#1300
• explicitly set --with-x=no if X11 is not included as dependency in R easyblock easybuild-easyblocks#1303

This cleanup basically only avoids that configure options are listed twice.

[boegel]

I'll look into a test report for several recent and also a couple of old R easyconfigs, but a full test is going to take forever (and probably not worth the trouble, since nothing really changed as long as you use the updated easyblock for R)...

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 54 out of 54 (5 easyconfigs in this PR)
node2644.swalot.os - Linux centos linux 7.4.1708, Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz, Python 2.7.5
See https://gist.github.com/2a40f275f8fdfcce6ea5e2a173215557 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 10 out of 10 (10 easyconfigs in this PR)
node2038.delcatty.os - Linux centos linux 7.4.1708, Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz, Python 2.7.5
See https://gist.github.com/a3bcca289d3ddf83ebb26674fab906d5 for a full test report.

[boegel]

@easybuilders/easybuild-easyconfigs-maintainers Good to go imho...

[migueldiascosta]

lgtm

[migueldiascosta]

Going in, thanks @boegel!