Generates:
Win32:  raylib.dll, libraylibdll.a (import library)
Linux:  libraylib.so

This fix allows GenMeshCubicmap() to create cubic maps having cells of
arbitrary sizes.

Fixed use-after-free in DestroyLight

Exposed Texture2D.id to Lua
Lights now have settable/gettable fields

Simplified module for Music and AudioStream
Added support for raw audio streaming (with example)

Added compound literals (C99) alternative for C++ compilers that don't
support this feature

Still some work left...

Many thanks to Marcelo Paez (paezao)

Well, not tested yet but it should work...

This library is only required by physac module to compulte physics in a
second thread

This commit restores the original method to compile all modules, but fix
prerequisites.