missing: drop old OOM related definitions

These are exposed earlier than linux-3.11. Let's just include linux/oom.h.

src/basic/parse-util.c

@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <inttypes.h>
+#include <linux/oom.h>
 #include <locale.h>
 #include <stdio.h>
 #include <stdlib.h>