Don't use a header that is not provided

Index: src/utils/fluidsynth_priv.h
--- src/utils/fluidsynth_priv.h.orig
+++ src/utils/fluidsynth_priv.h
@@ -28,10 +28,6 @@
 #include "config.h"
 #endif
 
-#if defined(__POWERPC__) && !(defined(__APPLE__) && defined(__MACH__))
-#include "config_maxmsp43.h"
-#endif
-
 #if defined(WIN32) && !defined(MINGW32)
 #include "config_win32.h"
 #endif