16:07 Adam Weinberger (adamw) 

editors/vim: Allow system vimrc, and include defaults.vim for vim-tiny

Two changes here (along with bumping to the latest upstream patch):

1) In the previous Vim commit, support for the system-wide vimrc/gvimrc
   was dropped because we went through contortions to fix loading order
   and monkey around with various defaults.

   However, many people used that file for their system. This commit
   re-adds support for loading it. All work for untangling the mess of
   loading defaults.vim and preventing circular loads is left to the
   user. We just support loading that file; what you do with it is your
   call.

2) vim-tiny is supposed to be the smallest possible Vim experience,
   being just the binary and no runtime library. However, without a
   viable defaults.vim, it's essentially just a larger, slower Vi.
   The vim-tiny package now ships with defaults.vim, which is patched
   to prevent errors from Vim loading the syntax library (which is not
   installed).

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