[Compile errors] Fix some errors on ancient toolchains.

Fix some random errors on older toolchains where sys/time.h does
not include time.h.

src/test_override.cc

@@ -1,6 +1,8 @@
 #include "config.h"
 
 #include <time.h>
+#include <sys/time.h>
+#include <stddef.h>
 
 time_t time(time_t *loc)
 {