Backed out changeset 01267d99f891 (bug 1248890) r=bustage

compare-mozconfigs-wrapper.py complains that mozconfig.rust
is included in mozconfigs\win64\release but not
mozconfigs\win64\release even though it is.

browser/config/mozconfigs/whitelist

@@ -65,6 +65,7 @@ whitelist['nightly']['win32'] += [
 whitelist['nightly']['win64'] += [
     '. "$topsrcdir/browser/config/mozconfigs/win64/common-win64"',
     '. "$topsrcdir/build/mozconfig.cache"',
+    '. "$topsrcdir/build/mozconfig.rust"',
 ]
 
 for platform in all_platforms:

browser/config/mozconfigs/win64/beta

@@ -14,6 +14,4 @@ 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/win64/release

@@ -20,6 +20,4 @@ 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"