audiofile mp3: disable SIMD for macos-old builds

Signed-off-by: falkTX <falktx@falktx.com>

source/modules/audio_decoder/ad_minimp3.c

@@ -25,6 +25,12 @@
 
 #include "ad_plugin.h"
 
+// disable SIMD for macos-old builds
+#include "CarlaDefines.h"
+#if defined(CARLA_OS_MAC) && !defined(CARLA_PROPER_CPP11_SUPPORT)
+# define MINIMP3_NO_SIMD
+#endif
+
 #define MINIMP3_FLOAT_OUTPUT
 #define MINIMP3_IMPLEMENTATION
 #include "minimp3_ex.h"