gitignore: Ignore dependency subdirs

Change-Id: I843da5c51d68102b992ce178404d8601c520229f
diff --git a/.gitignore b/.gitignore
index d525ada..d8c3ab3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 bin/*.cc
 bin/*.hh
+deps/*/
 *.o
 *.log
 *.so