mingw32 libraries provided were compiled with a different GCC version
(different computer) and seemed to be incompatible on linkage (missing
symbols).

Issues when pausin musing and trying to resume (not resuming!)

Note that Android and Desktop versions of OpenAL Soft come from the same
sources, recompiled for every platform

Moved all external libraries used by raylib to external folder inside
raylib src. Makefile has already been update and also the different
includes in raylib modules.

Improved makefiles!