Visual Studio builds: Improve flexibility of .pc generation
Visual Studio builds: Improve flexibility of .pc generation

Allow the use of shorthands using ${prefix} for exec_prefix, and
${exec_prefix} for includedir and libdir, which makes the generated .pc
files a bit cleaner and more flexible.

endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib