remove ogslib dependency from snow

* don't use ogslib specific header files
* don't use ogs_{malloc,free} but simply use the stack

Change-Id: I5604c594934b03d2fd83e1e465fc150fc542a475
diff --git a/mme/snow-3g.h b/mme/snow-3g.h
index a5320bb..0ba6a84 100644
--- a/mme/snow-3g.h
+++ b/mme/snow-3g.h
@@ -1,7 +1,7 @@
 #ifndef __SNOW_3G__
 #define __SNOW_3G__
 
-#include "ogs-core.h"
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {