only include switch_stun.h where needed. We use some c99isms in this header that do not get along well with some c++ compilers.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5411 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_stun.c

@@ -31,6 +31,7 @@
  *
  */
 #include <switch.h>
+#include <switch_stun.h>
 
 struct value_mapping {
 	const uint32_t value;