Return GSM to a state where it actually builds under dev mode.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@55352 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/gsm/inc/proto.h

@@ -9,11 +9,11 @@
 #ifndef	PROTO_H
 #define	PROTO_H
 
-#if __cplusplus
+#ifdef __cplusplus
 #	define	NeedFunctionPrototypes	1
 #endif
 
-#if __STDC__
+#ifdef __STDC__
 #	define	NeedFunctionPrototypes	1
 #endif