audio: disable NEON converters for now.

To be revisited after 2.0.9 ships!

(doesn't fix Bugzilla #4186, but stops the regression for the time being.)

src/audio/SDL_audiotypecvt.c

@@ -25,7 +25,8 @@
 #include "SDL_cpuinfo.h"
 #include "SDL_assert.h"
 
-#ifdef __ARM_NEON__
+/* !!! FIXME: disabled until we fix https://bugzilla.libsdl.org/show_bug.cgi?id=4186 */
+#if 0 /*def __ARM_NEON__*/
 #define HAVE_NEON_INTRINSICS 1
 #endif