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_ppc/bootm.c b/lib_ppc/bootm.c
index e03d763..0d702bf 100644
--- a/lib_ppc/bootm.c
+++ b/lib_ppc/bootm.c
@@ -29,7 +29,7 @@
 #include <command.h>
 #include <image.h>
 #include <malloc.h>
-#include <zlib.h>
+#include <u-boot/zlib.h>
 #include <bzlib.h>
 #include <environment.h>
 #include <asm/byteorder.h>