rename include/zlib.h to include/u-boot/zlib.h

Some systems have zlib.h installed in /usr/include/. This isn't the
desired file for u-boot code - we want the one in include/zlib.h.
This rename will avoid the conflict.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/lib_generic/zlib.c b/lib_generic/zlib.c
index 2b01c8f..d1cd44c 100644
--- a/lib_generic/zlib.c
+++ b/lib_generic/zlib.c
@@ -27,7 +27,7 @@
 
 #define _Z_UTIL_H
 
-#include "zlib.h"
+#include "u-boot/zlib.h"
 
 #ifndef local
 #  define local static