Bug 1322834 - fix clang in macosx64/l10n-mozconfig; r=Callek

The universal l10n-mozconfig includes build/macosx/mozconfig.common,
which sets up CC/CXX to point to the tooltool version of clang. We need
the tooltool version in order to build with the newer compiler features
that we use.

The additional changes to the mozconfig are done to make the macosx64
version match what we had in macosx-universal.

MozReview-Commit-ID: AnjuC904vqH

--HG--
extra : rebase_source : 71bea472621901498ad55490d2126568f54abe4d

browser/config/mozconfigs/macosx64/l10n-mozconfig

@@ -1,9 +1,19 @@
 . "$topsrcdir/browser/config/mozconfigs/common"
+. "$topsrcdir/build/macosx/mozconfig.common"
 
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 ac_add_options --with-branding=browser/branding/nightly
 
+if test "${MOZ_UPDATE_CHANNEL}" = "nightly"; then
+ac_add_options --with-macbundlename-prefix=Firefox
+fi
+
+export MOZILLA_OFFICIAL=1
+
+# Enable Telemetry
+export MOZ_TELEMETRY_REPORTING=1
+
 # Don't autoclobber l10n, as this can lead to missing binaries and broken builds
 # Bug 1283438
 mk_add_options AUTOCLOBBER=