Bug 1243363 - Add rust to beta and release mozconfigs. r=rail

browser/config/mozconfigs/linux64/beta

@@ -11,4 +11,5 @@ ac_add_options --enable-verify-mar
 
 mk_add_options MOZ_PGO=1
 
+. "$topsrcdir/build/unix/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"

browser/config/mozconfigs/linux64/release

@@ -18,4 +18,5 @@ mk_add_options MOZ_PGO=1
 # defines.sh during the beta cycle
 export BUILDING_RELEASE=1
 
+. "$topsrcdir/build/unix/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"

browser/config/mozconfigs/macosx-universal/beta

@@ -10,5 +10,6 @@ fi
 ac_add_options --enable-official-branding
 ac_add_options --enable-verify-mar
 
+. "$topsrcdir/build/macosx/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

browser/config/mozconfigs/macosx-universal/release

@@ -16,5 +16,6 @@ ac_add_options --enable-verify-mar
 # defines.sh during the beta cycle
 export BUILDING_RELEASE=1
 
+. "$topsrcdir/build/macosx/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

browser/config/mozconfigs/whitelist

@@ -40,7 +40,6 @@ whitelist['nightly']['linux64'] += [
     'STRIP_FLAGS="--strip-debug"',
     'ac_add_options --with-ccache=/usr/bin/ccache',
     '. "$topsrcdir/build/mozconfig.cache"',
-    '. "$topsrcdir/build/mozconfig.rust"',
 ]
 
 whitelist['nightly']['macosx-universal'] += [
@@ -53,7 +52,6 @@ whitelist['nightly']['macosx-universal'] += [
     'ac_add_options --disable-install-strip',
     'ac_add_options --enable-instruments',
     'ac_add_options --enable-dtrace',
-    '. "$topsrcdir/build/mozconfig.rust"',
 ]
 
 whitelist['nightly']['win32'] += [