Clang update script: bump gnuwin version to include sort.exe

LLVM r347097 introduced a lit test that requires sort.

Bug: 904337
Change-Id: I2daaea742207a3b5a77a0b95571352928641c287
Reviewed-on: https://chromium-review.googlesource.com/c/1354939
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#612202}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: cc84b69c3a6ec0f918a2812ec2794b55e7399ea1
diff --git a/scripts/update.py b/scripts/update.py
index f612e6c..8b762dc 100755
--- a/scripts/update.py
+++ b/scripts/update.py
@@ -347,7 +347,7 @@
     return
 
   gnuwin_dir = os.path.join(LLVM_BUILD_TOOLS_DIR, 'gnuwin')
-  GNUWIN_VERSION = '8'
+  GNUWIN_VERSION = '9'
   GNUWIN_STAMP = os.path.join(gnuwin_dir, 'stamp')
   if ReadStampFile(GNUWIN_STAMP) == GNUWIN_VERSION:
     print 'GNU Win tools already up to date.'