cmake PG should ensure correct libdir, otherwise ports are broken on linux

[Sergey Fedorov]

Currently nothing in MacPorts sets libdir for CMake ports. On MacOS this is
no issue. On Linux this leaves multiple ports broken, since CMake throws
libs into ${prefix}/lib64, where nothing looks for them, so all dependents
are broken.
As a few examples: libdeflate, lerc, libjpeg-turbo.

I think this should be fixed in cmake PG. Any objections to this?

Original PR for libdeflate, should be changed to a general fix:
https://github.com/macports/macports-ports/pull/25757
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