[PATCH] contrib/vim: simplify instructions for old vim support

Rely on the upstream filetype.vim instead of duplicating its rules in git's instructions for syntax highlighting support on pre-7.2 vim versions. The result is a shorter contrib/vim/README. More importantly, it lets us punt on maintenance of the autocmd rules. So now when we fix the upstream

Re: [PATCH] contrib/vim: simplify instructions for old vim support

On Thu, Jan 10, 2013 at 12:54:27PM -0800, Jonathan Nieder wrote: Rely on the upstream filetype.vim instead of duplicating its rules in git's instructions for syntax highlighting support on pre-7.2 vim versions. The result is a shorter contrib/vim/README. More importantly, it lets us punt