CMake: Don't limit generation of pkg-config file to UNIX
mingw-w64 uses the pkg-config files but does not set UNIX
The other option is to change it from UNIX
to NOT MSVC
to only exclude MSVC as afaik msvc can't use pkg-config files in any form
mingw-w64 uses the pkg-config files but does not set UNIX
The other option is to change it from UNIX
to NOT MSVC
to only exclude MSVC as afaik msvc can't use pkg-config files in any form