Bug 1375271 - Add an explicit --target to osx l10n mozconfigs. r=catlee

Before bug 1373150, the l10n mozconfigs would include
compilation-related mozconfigs, which include setting compiler paths,
and setting --target for cross builds. After bug 1373150, the
compilation-related mozconfigs are not included anymore, which made
--target unset for l10n builds, leaving it to configure to guess what it
is based on the host. Which for cross builds is Linux, so configure
would set things up for a linux build, which doesn't work to do osx
l10n repacks.

So we add back an explicit --target to those mozconfigs, without
including all the compilation-related things.

We set the target to x86_64-apple-darwin, which is the same as what was
set through build/macosx/cross-mozconfig.common. This is different from
what the native osx builds would get (x86_64-apple-darwin11.2.0), but
the extra version in that target is actually not relevant and native
builds shouldn't care that it's gone.

--HG--
extra : rebase_source : 79d1616f0cc8291fbc3432165891fdfe8f221f95

browser/config/mozconfigs/macosx64/l10n-mozconfig

@@ -1,6 +1,9 @@
 . "$topsrcdir/browser/config/mozconfigs/common"
 . "$topsrcdir/build/mozconfig.no-compile"
 
+# We need to indicate the target for cross builds
+ac_add_options --target=x86_64-apple-darwin
+
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 ac_add_options --with-branding=browser/branding/nightly

browser/config/mozconfigs/macosx64/l10n-mozconfig-devedition

@@ -1,6 +1,9 @@
 . "$topsrcdir/browser/config/mozconfigs/common"
 . "$topsrcdir/build/mozconfig.no-compile"
 
+# We need to indicate the target for cross builds
+ac_add_options --target=x86_64-apple-darwin
+
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 ac_add_options --with-branding=browser/branding/aurora