build: Remove pkg-config provided library names

The library names of Xcb, Xlib, and Wayland do not need to be queried from pkg-config,
instead they can be hardcoded to use the fallback names.

The intent of querying the library names was to prevent issues where the hardcoded name
was not the platform-appropriate name. But because <library>_LINK_LIBRARIES can have
more than one library name, the logic to assign <library>_LINK_LIBRARIES into a compile
definition breaks horribly. While it is possible to handle this in CMake, the dlopen code would
also have to handle it which is much more error prone.

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