Only include <sys/capability.h> if the header is present

Author: arrowd

src/util/util.h

@@ -33,7 +33,11 @@
 #include <netinet/in.h>
 #include <limits.h>
 #include <sys/un.h>
+#ifdef HAVE_SYS_CAPABILITY_H
 #include <sys/capability.h>
+#else
+typedef int cap_value_t;
+#endif
 #include <sys/param.h> /* for MIN()/MAX() */
 
 #include <talloc.h>