Change VS 2015 Update 1 package to VM version

build/vs_toolchain.py

Index: build/vs_toolchain.py
diff --git a/build/vs_toolchain.py b/build/vs_toolchain.py
index 6006b239ce9d12e1e04b3d3a9d343ba46e0285dc..1fd8a11445b275fce2be9029d85aadbcb6d75799 100755
--- a/build/vs_toolchain.py
+++ b/build/vs_toolchain.py
@@ -257,7 +257,7 @@ def _GetDesiredVsToolchainHashes():
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
   if os.environ.get('GYP_MSVS_VERSION') == '2015':
-    return ['8c3265958030a53f93f9cf027cfa5d5d9717fbf6'] # Update 1
+    return ['17c7ddb3595be5c6b9c98b6f930adad7e4456671'] # Update 1
   else:
     # Default to VS2013.
     return ['9ff97c632ae1fee0c98bcd53e71770eb3a0d8deb']