The plugin still works fine in versions starting from 2010,
but this was needed to make the project _build_ in VS 2013, which
is the blessed version for building LLVM projects these days.

http://reviews.llvm.org/D8021

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@231084 91177308-0d34-0410-b5e6-96231b3b80d8