Add MD5 support to the new uImage format

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
diff --git a/tools/.gitignore b/tools/.gitignore
index 0ce2e77..979f2da 100644
--- a/tools/.gitignore
+++ b/tools/.gitignore
@@ -4,6 +4,7 @@
 /environment.c
 /gen_eth_addr
 /img2srec
+/md5.c
 /mkimage
 /sha1.c
 /ubsha1