project: ignore build-local and dirty submodules

Change-Id: I55e81fb9e6e1ecf8862b614f70373acfc5af6cfd
Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>
diff --git a/.gitmodules b/.gitmodules
index 31602d4..cf108da 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,8 @@
 [submodule "sparkle/Sparkle"]
 	path = sparkle/Sparkle
 	url = https://github.com/sparkle-project/Sparkle.git
+	ignore = dirty
 [submodule "libqrencode"]
 	path = libqrencode
 	url = https://github.com/fukuchi/libqrencode.git
+	ignore = dirty