zlib: Inherit sys/stat.h from libc

Needed for the mkdir function

Change-Id: Id6111b8aecb21dd3bfc61b1d3aad6927d4120c63
diff --git a/src/contrib/minizip/unzip.c b/src/contrib/minizip/unzip.c
index 9093504..0cb6ffa 100644
--- a/src/contrib/minizip/unzip.c
+++ b/src/contrib/minizip/unzip.c
@@ -86,6 +86,8 @@
 #   include <errno.h>
 #endif
 
+#include <sys/stat.h>
+
 
 #ifndef local
 #  define local static