Defer warning about incompatible Python.
Defer warning about incompatible Python.

This uses the GundoDidNotLoad approach from 8de0b4ce478380e5c637 also
for the "Gundo requires that Vim be compiled with Python 2.4+" error.

Also retab the original GundoDidNotLoad code block and fix the English.

iff/dotfiles-old,iff/dotfiles-old