patch 8.0.1276: key lost when window closed in exit callback commit https://github.com/vim/vim/commit/a3f7e58bf846b28b347a5d5b96c2d829871bd212 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 9 13:21:58 2017 +0100 patch 8.0.1276: key lost when window closed in exit callback Problem: Typed key is lost when the terminal window is closed in exit callback. (Gabriel Barta) Solution: When the current window changes bail out of the wait loop. (closes #2302)

This is a MODIFIED version of libvterm.

The original can be found:
- on the original site (tar archive and Bazaar repository):
	http://www.leonerd.org.uk/code/libvterm/
- cloned on Github:
	https://github.com/neovim/libvterm

Modifications:
- Add a .gitignore file.
- Convert from C99 to C90.
- Other changes to support embedding in Vim.