use macro for EXTERN "C" begin and end lines in header files to clean up the headers, and to eliminate a format bug in emacs.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@1291 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_frame.h

@@ -36,12 +36,10 @@
 #ifndef SWITCH_FRAME_H
 #define SWITCH_FRAME_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #include <switch.h>
 
+BEGIN_EXTERN_C
+
 /*! \brief An abstraction of a data frame */
 struct switch_frame {
 	/*! a pointer to the codec information */
@@ -70,8 +68,6 @@ struct switch_frame {
 	switch_frame_flag flags;
 };
 
-#ifdef __cplusplus
-}
-#endif
+END_EXTERN_C
 
 #endif