fix solaris build

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15067 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/spandsp/src/at_interpreter.c

@@ -34,6 +34,10 @@
 #include "config.h"
 #endif
 
+#if defined(__sun)
+#define __EXTENSIONS__
+#endif
+
 #include <inttypes.h>
 #include <stdlib.h>
 #include <stdio.h>