Problem:    clr_history() does not work properly.
Solution:   Increment hisptr. Add a test. (Yegappan Lakshmanan)

https://github.com/vim/vim/commit/119d4693e06e68d4f099aa7287e375ae3d265fd0

Note: Only added a test. The change to `histptr` had already been made.

Problem:    syn-cchar defined with matchadd() does not appear if there are no
            other syntax definitions which matches buffer text.
Solution:   Check for startcol. (Ozaki Kiichi, haya14busa, closes vim/vim#757)

https://github.com/vim/vim/commit/4d585022023b96f6507e8cae5ed8fc8d926f5140

vim-patch:7.4.{1952, 1990, 2033, 2284}

Problem:    'cscopequickfix' option does not accept new value "a".
Solution:   Adjust list of command characters. (Ken Takata)

https://github.com/vim/vim/commit/6d20e1754461b0f8d395f2e3464f0dc1060497f7

All changes applied manually. Definition of `CSQF_CMDS` was moved to
`option_defs.h` in nvim.

Problem:    User commands don't support modifiers.
Solution:   Add the <mods> item. (Yegappan Lakshmanan, closes vim/vim#829)

https://github.com/vim/vim/commit/63a60ded3fd584847a05dccf058026e682abad90

Problem:    Windows cannot be identified.
Solution:   Add a unique window number to each window and functions to use it.

https://github.com/vim/vim/commit/86edef664efccbfe685906c854b9cdd04e56f2d5

Problem:    Visual-block shift breaks multi-byte characters.
Solution:   Compute column differently. (Yasuhiro Matsumoto) Add a test.

https://github.com/vim/vim/commit/20b4f463f4ab50fa9bcc9838aa94101fa5698125

These tests should be here, not in the Makefile.