tools: gitignore *.exe binaries

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/tools/.gitignore b/tools/.gitignore
index 03f54ef..cb067a4 100644
--- a/tools/.gitignore
+++ b/tools/.gitignore
@@ -8,3 +8,4 @@
 /ncp
 /ubsha1
 /inca-swap-bytes
+/*.exe