Identifying and maintaining a "secure" subset of the API would be too
much busywork. So just disable the entire thing.

Problem:    Misspelled mkspellmem as makespellmem.
Solution:   Drop duplicate help entry, fix test. (Naruhiko Nishino, Ken
            Takata, closes vim/vim#4437)
https://github.com/vim/vim/commit/076073950c44ea0e35bc39d539dc7ab41bf9c7ec

Problem:    Error when editing test file.
Solution:   Remove part of modeline.
https://github.com/vim/vim/commit/3020a87cb121123abf1e9a1eca0eddac241fc481

Problem:    Modeline test fails with python but without pythonhome.
Solution:   Correct test argument.
https://github.com/vim/vim/commit/e09244ee3567d658c293fb1ae0d47a1a8be870ac

Problem:    can set 'modelineexpr' in modeline.
Solution:   Add P_SECURE flag.
https://github.com/vim/vim/commit/7e800c6047c8a9cc3e5cbc019a4dc91ec36616b1

Problem:    Using expressions in a modeline is unsafe.
Solution:   Disallow using expressions in a modeline, unless the
            'modelineexpr' option is set.  Update help, add more tests.
https://github.com/vim/vim/commit/110289e78195b6d01e1e6ad26ad450de476d41c1

Problem:    Modeline test with keymap still fails.
Solution:   Check that the keymap feature is available for the failure assert.
https://github.com/vim/vim/commit/3067a4dd0d768d1e4a47cf3c100f3e2b462717d7

Problem:    Modeline test with keymap fails.
Solution:   Check that the keymap feature is available.
https://github.com/vim/vim/commit/4ace6ab7e72151d78f1563b23b498ed20fa00211

Problem:    Modeline test fails when run by root.
Solution:   Set 'modeline' for the test. (James McCoy, closes vim/vim#3592)
https://github.com/vim/vim/commit/9691f82f862ed18c2e3e48f9d2cd902bb947f803

N/A patches:

vim-patch:8.1.0208: file left behind after running individual test

Problem:    Duplicate test function name.
Solution:   Rename both functions.
https://github.com/vim/vim/commit/cd96eef3a869557bd3d2d4497861d87cb525db06