Bug 1385085 - Ignore linux tooltool manifest change differences.

We still get gcc from tooltool on linux, since we aren't using taskcluster
toolchain dependencies.

MozReview-Commit-ID: BoteM8s7sik

--HG--
extra : histedit_source : 7589fa248bee50f3a765a3499fe0e25d96d20e8d

mail/config/tooltool-manifests/linux32/check-sync-exceptions

@@ -0,0 +1,4 @@
+# Bug 1385085
+# Since mozilla-central switchted to using taskcluster toolchain dependencies,
+# we need to keep the last version gcc in tooltool available for linux builds.
+releng.manifest

mail/config/tooltool-manifests/linux64/check-sync-exceptions

@@ -0,0 +1,4 @@
+# Bug 1385085
+# Since mozilla-central switchted to using taskcluster toolchain dependencies,
+# we need to keep the last version gcc in tooltool available for linux builds.
+releng.manifest