While here:
* remove input_overlay and task_overlay from linking blacklist
* move -Werror to CC invocation since C++ refuses to use it
* copy the quiet build mode from the main Makefile and make it the
default
* temporarily define DEPRECATED for gpu_old.h to allow succesful build
* replace the call to command_event() with one to retroarch_main_quit()
in a failure case
* add missing uncompr.o in Makefile.common for HAVE_BUILTINZLIB