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_log.h

@@ -38,15 +38,10 @@
 #ifndef SWITCH_LOG_H
 #define SWITCH_LOG_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-#ifdef _FORMATBUG
-}
-#endif
-
 #include <switch.h>
 
+BEGIN_EXTERN_C
+
 ///\defgroup log Logger Routines
 ///\ingroup core1
 ///\{
@@ -122,8 +117,6 @@ SWITCH_DECLARE(const char *) switch_log_level2str(switch_log_level level);
 SWITCH_DECLARE(switch_log_level) switch_log_str2level(const char *str);
 
 ///\}
-#ifdef __cplusplus
-}
-#endif
+END_EXTERN_C
 
 #endif