tweak ifdef for _MSC_VER instead of WIN32

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3731 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_platform.h

@@ -42,8 +42,7 @@ SWITCH_BEGIN_EXTERN_C
 
 #include <stdio.h>
 
-/* OMG */
-#ifdef WIN32
+#ifdef _MSC_VER
 #define __SWITCH_FUNC__ __FUNCTION__
 #else
 #define __SWITCH_FUNC__ (const char *)__func__