Fortran: Add support for GNU >= 4.9 compressed modules (#14975)
From the GCC 4.9 release notes for Fortran: https://gcc.gnu.org/gcc-4.9/changes.html "Module files: The version of the module files (.mod) has been incremented; additionally, module files are now compressed." Teach cmDependsFortran::ModulesDiffer to look for the gzip magic numbers at the beginning of the module file. If found, assume the module was produced by gfortran >= 4.9. The modules do not appear to contain the date as earlier versions did so we can compare the content directly and do not actually need to decompress.
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