This reverts commit 4be0e92db01a502863ac4bb26dd0fee16d833145.

Unfortunately, that commit stalled the Windows builds on GHA and likely requires
other patches to work properly.

Problem:    Delete() can not handle a file name that looks like a pattern.
Solution:   Use readdir() instead of appending "/*" and expanding wildcards.
            (Ken Takata, closes vim/vim#4424, closes vim/vim#696)
https://github.com/vim/vim/commit/701ff0a3e53d253d7300c385e582659bbff7860d

Problem:    :argadd in empty buffer changes the buffer name. (Pavol Juhas)
Solution:   Don't re-use the current buffer when not going to edit the file.
            (closes vim/vim#3397)  Do re-use the current buffer for :next.
https://github.com/vim/vim/commit/32bbd00949c585ea1c9da13197279a175097eddd

Problem:    ":argdel" does not work like ":.argdel" as documented. (Alexey
            Demin)
Solution:   Make ":argdel" work like ":.argdel". (closes vim/vim#6727)
            Also fix giving the error "0 more files to edit".
https://github.com/vim/vim/commit/7b22117c4ecf383b6f35acef041773a83ec28220

Problem:    Using empty string for current buffer is unexpected.
Solution:   Make the argument optional for bufname() and bufnr().
https://github.com/vim/vim/commit/a8eee21e75324d199acb1663cb5009e03014a13a

Problem:    :argdo is not tested
Solution:   Add a test.
https://github.com/vim/vim/commit/72e1b39111389001a20fbe8aa344ce2fe0a7e1a4

Problem:    :args output is not aligned.
Solution:   Output a line break after the last item in a row.
https://github.com/vim/vim/commit/74da39373c90fcb390068903b5bbb93ce7ac16fa

vim-patch:8.1.1750: depending on the terminal width :version may miss a line break

Problem:    Depending on the terminal width :version may miss a line break.
Solution:   Add a line break when needed.
https://github.com/vim/vim/commit/8a5c29aee978345132ad7f318b8a84633c33905c

vim-patch:8.1.1760: extra line break for wrapping output of :args

Problem:    Extra line break for wrapping output of :args.
Solution:   Avoid the extra line break. (Daniel Hahler, closes vim/vim#4737)
https://github.com/vim/vim/commit/9800bfe0fc7596e8fee97172139f0777bac639fb

This just moves the test to where it is in Vim.

This reverts commit ce1b4f95fe684082cc9fb7e7e018e4f7c04338c4.

Problem:    Accessing invalid memory with long argument name.
Solution:   Use item_count instead of checking for a terminating NULL.
            (Dominique Pelle, closes vim/vim#3444)
https://github.com/vim/vim/commit/e961cba3cb8281c47f1dc2c2bc031b07504f17d4