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_platform.h

@@ -34,9 +34,7 @@
 #ifndef SWITCH_PLATFORM_H
 #define SWITCH_PLATFORM_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+BEGIN_EXTERN_C
 
 #ifdef __ICC
 #pragma warning (disable:810 869 981 279 1469 188)
@@ -153,8 +151,6 @@ typedef unsigned long	in_addr_t;
 #define DoxyDefine(x)
 #endif
 
-#ifdef __cplusplus
-}
-#endif
+END_EXTERN_C
 
 #endif