Fix building of ozmod_ss7_boost on FreeBSD(7)

git-svn-id: http://svn.openzap.org/svn/openzap/trunk@545 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/openzap/src/include/openzap.h

@@ -35,7 +35,7 @@
 #define OPENZAP_H
 
 
-#ifndef _XOPEN_SOURCE
+#if !defined(_XOPEN_SOURCE) && !defined(__FreeBSD__)
 #define _XOPEN_SOURCE 600
 #endif