[build][cmake] Improve cmake config file generation

[mobius3]

This allows for finding raylib on a non-standard location (eg, not in /usr/lib{,64}) when building via cmake.

The current raylib-config.cmake is a find script, not a config one.

[raysan5]

@mobius3 Thanks for the review, it looks ok to me but I'm not a CMake expert...

[raysan5]

@mobius3 It seems this change broke the CodeQL system:

[  9%] Linking C executable audio_mixed_processor
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_context_uninit__alsa':
raudio.c:(.text+0x3f76): undefined reference to `dlclose'
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_context_uninit__pulse':
raudio.c:(.text+0x120f9): undefined reference to `dlclose'
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_context_init__pulse':
raudio.c:(.text+0x25d8e): undefined reference to `dlopen'
/usr/bin/ld: raudio.c:(.text+0x25dd1): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x25e1b): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x25e65): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x25eaf): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x25ef9): undefined reference to `dlsym'
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o):raudio.c:(.text+0x25f43): more undefined references to `dlsym' follow
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_context_init__pulse':
raudio.c:(.text+0x2715a): undefined reference to `dlclose'
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_context_init__alsa':
raudio.c:(.text+0x27b8e): undefined reference to `dlopen'
/usr/bin/ld: raudio.c:(.text+0x27bd1): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x27c1b): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x27c65): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x27caf): undefined reference to `dlsym'
/usr/bin/ld: raudio.c:(.text+0x27cf9): undefined reference to `dlsym'
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o):raudio.c:(.text+0x27d43): more undefined references to `dlsym' follow
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_dlopen':
raudio.c:(.text+0x2b16e): undefined reference to `dlopen'
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_dlsym':
raudio.c:(.text+0x2b1ef): undefined reference to `dlsym'
/usr/bin/ld: ../raylib/libraylib.a(raudio.c.o): in function `ma_dlclose':
raudio.c:(.text+0x2b1b8): undefined reference to `dlclose'
/usr/bin/ld: ../raylib/libraylib.a(posix_module.c.o): in function `_glfwPlatformLoadModule':
posix_module.c:(.text+0xa): undefined reference to `dlopen'
/usr/bin/ld: ../raylib/libraylib.a(posix_module.c.o): in function `_glfwPlatformFreeModule':
posix_module.c:(.text+0x15): undefined reference to `dlclose'
/usr/bin/ld: ../raylib/libraylib.a(posix_module.c.o): in function `_glfwPlatformGetModuleSymbol':
posix_module.c:(.text+0x25): undefined reference to `dlsym'
collect2: error: ld returned 1 exit status
make[2]: *** [examples/CMakeFiles/audio_mixed_processor.dir/build.make:103: examples/audio_mixed_processor] Error 1
make[1]: *** [CMakeFiles/Makefile2:752: examples/CMakeFiles/audio_mixed_processor.dir/all] Error 2
make: *** [Makefile:[166](https://github.com/raysan5/raylib/actions/runs/12056926099/job/33620456819#step:7:167): all] Error 2

Ref: https://github.com/raysan5/raylib/actions/runs/12056926099/job/33620456819

[raysan5]

Just reverted this PR to avoid following PRs to be added over a potentially breaking change (or at least not passing CI tests)

[raysan5]

Not sure if the issue was related but just noticed another PR: #4547

Maybe the issue was related?