Bug 1248461 - Enable rust for win32 official builds. r=mshal

This uses a repacked version of the upstream 1.8 nightly
builds. We need 1.8 for WinXP support, but it's safe to
use nightly until this stablises because other platforms
are using stable rust and will catch any nightly-only
feature use.

For these builds I used the channel-rustc-nightly manifest instead
of the older channel-rust-* manifest, to get the separate std packages.

tar xf rustc-nightly-i686-pc-windows-msvc.tar.gz
rustc-nightly-i686-pc-windows-msvc/install.sh --prefix=rustc/

tar xf rust-std-nightly-i686-pc-windows-msvc.tar.gz
rust-std-nightly-i686-pc-windows-msvc/install.sh --prefix=rustc/

tar cjf rustc.tar.bz2 rustc/*

We're already riding the trains on macosx and linux64, enabling
this for all channels this avoids having to whitelist the config.

browser/config/mozconfigs/win32/beta

@@ -13,4 +13,6 @@ mk_add_options MOZ_PGO=1
 ac_add_options --enable-official-branding
 ac_add_options --enable-verify-mar
 
+. "$topsrcdir/build/mozconfig.rust"
+
 . "$topsrcdir/build/mozconfig.common.override"

browser/config/mozconfigs/win32/debug

@@ -28,5 +28,7 @@ export MOZ_PACKAGE_JSSHELL=1
 
 ac_add_options --with-branding=browser/branding/nightly
 
+. "$topsrcdir/build/mozconfig.rust"
+
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

browser/config/mozconfigs/win32/nightly

@@ -6,5 +6,7 @@ ac_add_options --enable-verify-mar
 
 ac_add_options --with-branding=browser/branding/nightly
 
+. "$topsrcdir/build/mozconfig.rust"
+
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

browser/config/mozconfigs/win32/release

@@ -19,4 +19,6 @@ ac_add_options --enable-verify-mar
 # defines.sh during the beta cycle
 export BUILDING_RELEASE=1
 
+. "$topsrcdir/build/mozconfig.rust"
+
 . "$topsrcdir/build/mozconfig.common.override"

browser/config/tooltool-manifests/win32/releng.manifest

@@ -6,6 +6,13 @@
 "filename": "mozmake.exe"
 },
 {
+"size": 80513610,
+"digest": "a388df6ce743be521ba688132d06ba86d225673b53f71f9c7c0d3189adf16f553088d8d359f583f958e886583de9583df53873c85c34abf33b2d55ee7d807206",
+"algorithm": "sha512",
+"filename": "rustc-nightly-i686-pc-windows-msvc.tar.bz2",
+"unpack": true
+},
+{
 "size": 167175,
 "digest": "0b71a936edf5bd70cf274aaa5d7abc8f77fe8e7b5593a208f805cc9436fac646b9c4f0b43c2b10de63ff3da671497d35536077ecbc72dba7f8159a38b580f831",
 "algorithm": "sha512",