Intel had the bright idea to name their OpenMP command line flag

  -openmp

which of course cannot be distinguished from

  -o penmp

It seems they also realized this and now also allow -fopenmp or -qopenmp
as flags. Due to commit 2121b2e5 the autodetected -openmp was now
appended into the linker command line at the end, causing all C programs
to be named "penmp".

Fix by trying the -fopenmp, -qopenmp flags before -openmp in the
Fortran compiler flag detection m4 macro.