[Backend/RGFW] Update Makefile and such

[CrackedPixel]

There are a few things to note:

1. edited .gitignore to ignore the wayland generated files from GLFW and RGFW
2. moved GLFW LDFLAGS for wayland due to it being too early in the file and overridden
3. added wayland generated code for RGFW (copying GLFW 99% identical)
4. added build targets when using wayland+RGFW -- this is due to glfw already having it included but rgfw does not (single header vs full compiled lib)
5. added makefile section for OSX
6. added missing mg_gamepads_free in ClosePlatform

[CrackedPixel]

I don't know whats with the SHADER_LOC_VERTEX_INSTANCETRANSFORM (singular) error in the automated build tests 🤔 the correct is SHADER_LOC_VERTEX_INSTANCETRANSFORM**S** (plural) and thats what all the files have...

https://github.com/raysan5/raylib/blob/master/src/rcore.c#L1308 (singular)
https://github.com/raysan5/raylib/blob/master/src/raylib.h#L817 (plural)

EDIT: was this changed recently? its not due to my PR at least 😅

I made a separate PR to address this and once that's settled we can re-run the tests for this PR: #5592

[raysan5]

@CrackedPixel Nice! Merging!