[PATCH][RFC] Extend locations where to seach for Fortran pre-include.

[Martin Liška]

Hi.

Following patch is a follow up of the discussion we had on IRC about
locations where a Fortran pre-include should be searched.

With the patch applied I see now:
$ strace -f -s512 ./xgcc -B. ~/Programming/testcases/usage.F90  -c 2>&1 | grep math-vector
access("./x86_64-pc-linux-gnu/9.0.0/math-vector-fortran.h", R_OK) = -1 ENOENT (No such file or directory)
access("./math-vector-fortran.h", R_OK) = -1 ENOENT (No such file or directory)
access("/home/marxin/bin/gcc2/bin/../include/finclude/x86_64-pc-linux-gnu/9.0.0/math-vector-fortran.h", R_OK) = -1 ENOENT (No such file or directory)
access("/home/marxin/bin/gcc2/bin/../include/finclude/math-vector-fortran.h", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/include/finclude/x86_64-pc-linux-gnu/9.0.0/math-vector-fortran.h", R_OK) = -1 ENOENT (No such file or directory)
access("/usr/include/finclude/math-vector-fortran.h", R_OK) = -1 ENOENT (No such file or directory)

Martin
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