Bug 1351474 - use Mozilla fork of libdmg-hfsplus; r=ted

The latest upstream version produces .dmg files that have fsck errors,
and some versions of OSX complain that the image is corrupted. The
previous version of libdmg-hfsplus that we were using (1d72dd62a)
doesn't have fsck errors, but it also doesn't preserve file permissions.
Our fork is based on the older version and backports the file permission
commits.

MozReview-Commit-ID: Bjwy6MJ98Ud

--HG--
extra : rebase_source : 5ecb3a3bbe9d8fe655fda7c1ce615bac91dc26fb

taskcluster/scripts/misc/build-libdmg-hfsplus.sh

@@ -8,11 +8,12 @@ WORKSPACE=$HOME/workspace
 STAGE=$WORKSPACE/dmg
 UPLOAD_DIR=$WORKSPACE/artifacts
 
-# There's no single well-maintained fork of libdmg-hfsplus, but this
-# branch currently has some fixes we need.
-: LIBDMG_REPOSITORY    ${LIBDMG_REPOSITORY:=https://github.com/andreas56/libdmg-hfsplus}
-# This is the current head of the `from_zarvox` branch.
-: LIBDMG_REV           ${LIBDMG_REV:=81dd75fd1549b24bf8af9736ac25518b367e6b63}
+# There's no single well-maintained fork of libdmg-hfsplus, so we forked
+# https://github.com/andreas56/libdmg-hfsplus/ to get a specific version and
+# backport some patches.
+: LIBDMG_REPOSITORY    ${LIBDMG_REPOSITORY:=https://github.com/mozilla/libdmg-hfsplus}
+# The `mozilla` branch contains our fork.
+: LIBDMG_REV           ${LIBDMG_REV:=mozilla}
 
 mkdir -p $UPLOAD_DIR $STAGE