Use the new Windows environment for target detection

This follows the LLVM change to canonicalise the Windows target triple
spellings.  Rather than treating each Windows environment as a single entity,
the environments are now modelled properly as an environment.  This is a
mechanical change to convert the triple use to reflect that change.

llvm-svn: 204978
diff --git a/clang/test/Driver/clang-translation.c b/clang/test/Driver/clang-translation.c
index f0c44c5..54e5bbe 100644
--- a/clang/test/Driver/clang-translation.c
+++ b/clang/test/Driver/clang-translation.c
@@ -203,7 +203,7 @@
 // AMD64-MINGW: clang
 // AMD64-MINGW: "-cc1"
 // AMD64-MINGW: "-triple"
-// AMD64-MINGW: "amd64--mingw32"
+// AMD64-MINGW: "amd64--windows-gnu"
 // AMD64-MINGW: "-munwind-tables"
 
 // RUN: %clang -target i686-linux-android -### -S %s 2>&1 \