OpenAL audio backend is being forced on HTML5 and OSX

Some programs like tools could not require audio support

See #401 for the discussion.
Also bumps version number to 1.9.2 without the -dev,
because neither ELF nor MachO like such a suffix.
The -dev suffix will have to be restricted to the git tags.

Updated to latest GLFW library and working on Wayland support, still
looking how to implement it on raylib because it just exposes
PLATFORM_DESKTOP and defaults to X11 windowing system on Linux...

OpenAL Soft backend is still available in audio module, I'm thinking if
exposing it for building in some way or just left it there for advance
users to switch to it manually in case of necessity...

Corrected issue with RPI_CROSS_COMPILE

Some people might find this handly

Some distributions build the programs with a specific set of CFLAGS.
Lets allow that by adding raylibs flags.

Correcting details that pop-up when testing the different platforms

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