Remove warning.

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@4190 0c269be4-1314-0410-8aa9-9f06e86f4224

posix/JackSystemDeps_os.h

@@ -25,7 +25,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #include <signal.h>
 #include <dlfcn.h>
 
+#ifndef UINT32_MAX 
 #define UINT32_MAX 4294967295U
+#endif
 
 #define DRIVER_HANDLE void*
 #define LoadDriverModule(name) dlopen((name), RTLD_NOW | RTLD_GLOBAL)