Bug 770286: Prevent git LF-to-CRLF autoconversion r=glandium

Currently git for Windows converts LF to CRLF by default, so this change prevents that to match the mercurial behavior.

Differential Revision: https://phabricator.services.mozilla.com/D32001

--HG--
extra : moz-landing-system : lando

.gitattributes

@@ -0,0 +1,2 @@
+# Prevent line ending normalization to follow the mercurial behavior
+* -text