Add script to update vim-cmake-syntax from upstream

Utilities/Scripts/update-vim-syntax.bash

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+shopt -s dotglob
+
+readonly name="vim-cmake-syntax"
+readonly ownership="vim-cmake-syntax upstream <kwrobot@kitware.com>"
+readonly subtree="Auxiliary/vim"
+readonly repo="https://github.com/pboettch/vim-cmake-syntax.git"
+readonly tag="master"
+readonly shortlog=true
+readonly paths="
+  indent
+  syntax
+  cmake.vim.in
+  extract-upper-case.pl
+"
+
+extract_source () {
+    git_archive
+}
+
+. "${BASH_SOURCE%/*}/update-third-party.bash"