patchcompile fixes for solaris: include limits.h one more time

--- a/checkout-cache.c
+++ b/checkout-cache.c
@@ -34,6 +34,7 @@
  */
 #include <sys/types.h>
 #include <dirent.h>
+#include <limits.h>
 #include "cache.h"
 
 static int force = 0, quiet = 0, not_new = 0;