avoid excessively long shebang line in compile script for WRF

[boegel]

(created using eb --new-pr)

[boegel]

Test report by @boegel

Overview of tested easyconfigs (in order)

• SUCCESS WRF-3.9.1.1-foss-2020b-dmpar.eb
• SUCCESS WRF-3.9.1.1-intel-2020b-dmpar.eb
• SUCCESS WRF-4.2.2-foss-2020b-dmpar.eb
• SUCCESS WRF-4.3-foss-2021a-dmpar.eb

Build succeeded for 4 out of 4 (4 easyconfigs in total)
node2602.swalot.os - Linux centos linux 7.9.2009, x86_64, Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz (haswell), Python 3.6.8
See https://gist.github.com/e505db270a738d78d984892cbf60293b for a full test report.

[ocaisa]

@boegel Code looks good to me, can you just confirm that you see what you expect in the final compile scripts (for both cases)?

[boegel]

• for WRF-3.9.1.1-foss-2020b-dmpar.eb, with tcsh as proper build dependency provided by EasyBuild:

  $ head -1 software/WRF/3.9.1.1-foss-2020b-dmpar/WRFV3/compile
  #!/usr/bin/env tcsh
  

• for WRF-3.9.1.1-foss-2020b-dmpar.eb, with --filter-deps tcsh to use tcsh provided by OS (so no patching done to compile script):

  $ head -1 software/WRF/3.9.1.1-foss-2020b-dmpar/WRFV3/compile
  #!/bin/csh -f
  

• for WRF-3.9.1.1-foss-2020a-dmpar.eb in EESSI, where we're using --sysroot:

  $ head -1 /cvmfs/pilot.eessi-hpc.org/versions/2021.12/software/linux/x86_64/intel/skylake_avx512/software/WRF/3.9.1.1-foss-2020a-dmpar/WRFV3/compile
  #!/cvmfs/pilot.eessi-hpc.org/versions/2021.12/compat/linux/x86_64/usr/bin/env tcsh
  

Note that the lack of -f (which we need to drop when using /usr/bin/env tcsh) doesn't matter, from the tcsh man page:

-f  The shell does not load any resource or startup files, or perform any command hashing, and thus starts faster.

@ocaisa