Log Message:
Add a special case for f77 on MirBSD. This is what the wrapper scripts call
the f2c frontend. It is not recognized as GCC even though there is a gcc
underneath. Thus, use "-Wl," to introduce linker options.

This unbreaks the build of shared libraries written in Fortran on MirBSD
(exotic combination, yes I know) such as blas.

Bump PKGREVISION.