Relax check for XOPEN_VERSION.

It's not clear that we actually require XOPEN_VERSION to be 600 or greater
at this time, so skip the check for now.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@212672 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk.h

@@ -28,9 +28,12 @@
 #if _POSIX_VERSION < 200112L
 #error System does not support POSIX version 200112.
 #endif
+
+/* It is not clear if we need this version check at this time.
 #if _XOPEN_VERSION < 600
 #error System does not support XOPEN version 600.
 #endif
+*/
 
 #if !defined(NO_MALLOC_DEBUG) && !defined(STANDALONE) && defined(MALLOC_DEBUG)
 #include "asterisk/astmm.h"