WiX: package up git-clang-format

This helper script enables the use of `git clang-format` for changes
which is helpful for re-formatting commits, including those for the
Swift toolchain.

Author: compnerd

platforms/Windows/cli/cli.wxs

@@ -30,6 +30,10 @@
         <File Source="$(TOOLCHAIN_ROOT)\usr\bin\clang-format.exe" />
       </Component>
 
+      <Component>
+        <File Source="$(TOOLCHAIN_ROOT)\usr\bin\git-clang-format" />
+      </Component>
+
       <Component>
         <File Source="$(TOOLCHAIN_ROOT)\usr\bin\clang-tidy.exe" />
       </Component>