Fix non-griffin build for 3DS and make it the default

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

deps/rcheevos/src/rc_compat.c

@@ -3,6 +3,10 @@
 #include <ctype.h>
 #include <stdarg.h>
 
+#if defined(_3DS) && !defined(_POSIX_THREADS)
+#include <../rthreads/ctr_pthread.h>
+#endif
+
 #ifdef RC_C89_HELPERS
 
 int rc_strncasecmp(const char* left, const char* right, size_t length)