commit https://github.com/vim/vim/commit/1000565c3a2439c9a7c9759284814dbf3b8bc20d Author: Bram Moolenaar <Bram@vim.org> Date: Thu Dec 31 21:03:23 2015 +0100 patch 7.4.1012 Problem: Vim overwrites the value of $PYTHONHOME. Solution: Do not set $PYTHONHOME if it is already set. (Kazuki Sakamoto, closes https://github.com/vim/vim/issues/500)

" Vim support file to switch off detection of file types
"
" Maintainer:	Bram Moolenaar <Bram@vim.org>
" Last change:	2001 Jun 11

if exists("did_load_filetypes")
  unlet did_load_filetypes
endif

" Remove all autocommands in the filetypedetect group
silent! au! filetypedetect *