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_core.h

@@ -38,15 +38,10 @@
 #ifndef SWITCH_CORE_H
 #define SWITCH_CORE_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-#ifdef _FORMATBUG
-}
-#endif
-
 #include <switch.h>
 
+BEGIN_EXTERN_C
+
 #define SWITCH_MAX_CORE_THREAD_SESSION_OBJS 128
 #define SWITCH_MAX_STREAMS 128
 
@@ -984,10 +979,6 @@ SWITCH_DECLARE(void) switch_core_set_globals(void);
   \}
 */
 
-
-#ifdef __cplusplus
-}
-#endif
-
+END_EXTERN_C
 
 #endif