Added a flush after fprintf

This is patch [#6921] Make error printing a bit more reliable
from GSR
http://projects.blender.org/tracker/index.php?func=detail&aid=6921&group_id=9&atid=127

Kent

source/creator/creator.c

@@ -704,6 +704,7 @@ static void error_cb(char *err)
 static void mem_error_cb(char *errorStr)
 {
 	fprintf(stderr, errorStr);
+	fflush(stderr);
 }
 
 void setCallbacks(void)