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_buffer.h

@@ -38,12 +38,10 @@
 #ifndef SWITCH_BUFFER_H
 #define SWITCH_BUFFER_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #include <switch.h>
 
+BEGIN_EXTERN_C
+
 /**
  * @defgroup switch_buffer Buffer Routines
  * @ingroup core1
@@ -111,10 +109,6 @@ SWITCH_DECLARE(switch_size_t) switch_buffer_toss(switch_buffer *buffer, switch_s
 SWITCH_DECLARE(void) switch_buffer_zero(switch_buffer *buffer);
 /** @} */
 
-
-#ifdef __cplusplus
-}
-#endif
-
+END_EXTERN_C
 
 #endif