ignore new mkenvimage tool

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/tools/.gitignore b/tools/.gitignore
index 98a5c78..e4d2c2f 100644
--- a/tools/.gitignore
+++ b/tools/.gitignore
@@ -2,6 +2,7 @@
 /envcrc
 /gen_eth_addr
 /img2srec
+/mkenvimage
 /mkimage
 /mpc86x_clk
 /mxsboot