Add #ifdef for WCOREDUMP

AIX doesn't have WCOREDUMP, so compilation failed there.  Add #ifdef.

Partially addresses #531.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4151 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/vtc_varnish.c

@@ -381,9 +381,14 @@ varnish_wait(struct varnish *v)
 	vtc_log(v->vl, 2, "R %d Status: %04x", r, status);
 	if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
 		return;
+#ifdef WCOREDUMP
 	vtc_log(v->vl, 0, "Bad exit code: %04x sig %x exit %x core %x",
 	    status, WTERMSIG(status), WEXITSTATUS(status),
 	    WCOREDUMP(status));
+#else
+	vtc_log(v->vl, 0, "Bad exit code: %04x sig %x exit %x",
+	    status, WTERMSIG(status), WEXITSTATUS(status));
+#endif
 }
 
 /**********************************************************************