First batch of changes required for MacOS X build. Orignal submission from

Phil Atkin, merged by Robert Osfield.

src/osgPlugins/obj/glm.cpp

@@ -12,7 +12,12 @@
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
+#include <osg/Math>
+#ifdef __DARWIN_OSX__
+#include <stdlib.h>
+#else
 #include <malloc.h>
+#endif
 #include "glm.h"