Ref: https://github.com/neovim/neovim/issues/10302
Fixes https://github.com/neovim/neovim/issues/9071.

Added in 4ae7acd15 initially, but seems to not be necessary anymore,
and/or should be send upstream otherwise.

$ bzr log --line --forward -r v0.20..

372: Paul "LeoNerd" Evans 2017-03-30 {v0.20} Bumped VERSION to 0.20
373: Paul "LeoNerd" Evans 2017-04-10 [merge] Apply typo fixes from jamessan
374: Paul "LeoNerd" Evans 2017-11-29 Build termkey.pc by invoking a small shell script instead of sed'ing a template
375: Paul "LeoNerd" Evans 2018-03-29 Implement mouse key parsing (thanks Marc André Tanner <mat@brain-dump.org>)
376: Paul "LeoNerd" Evans 2019-01-02 Bugfix for infinite CPU spin on TERM=dumb, which has no terminfo key strings
377: Paul "LeoNerd" Evans 2019-02-14 Fix a couple of valgrind-cleanness errors in DEBUG mode
378: Paul "LeoNerd" Evans 2019-02-14 Fix valgrind uninitialised value warning
379: Paul "LeoNerd" Evans 2019-02-14 Remember to unibi_destroy() even if we never (lazily) loaded terminfo
380: Paul "LeoNerd" Evans 2019-02-14 Bugfix memory leak in TI driver on xterm
381: Paul "LeoNerd" Evans 2019-02-17 driver-ti.c does not need a separate TYPE_MOUSE node type since TERMKEY_TYPE_MOUSE already exists
382: Paul "LeoNerd" Evans 2019-02-17 Perform TI string lookup by iterating all the strings we care about, rather than iterating everything in the DB; that way a hook function can invent new strings
383: Paul "LeoNerd" Evans 2019-02-17 Avoid nonstandard \e sequence in unit tests (via neovim https://github.com/neovim/neovim/blob/master/third-party/patches/libtermkey-Fix-escape-sequences-for-MSVC.p...
384: Paul "LeoNerd" Evans 2019-02-17 win32: Win32 lacks <unistd.h> and S_ISFIFO()
385: Paul "LeoNerd" Evans 2019-02-17 win32: Win32 needs help to get ssize_t
386: Paul "LeoNerd" Evans 2019-02-17 win32: Win32 has no <termios.h>
387: Paul "LeoNerd" Evans 2019-02-17 win32: Win32 has no poll() so cannot provide termkey_waitkey()
388: Paul "LeoNerd" Evans 2019-02-17 win32: Win32 has no <strings.h> and needs help getting strcasecmp()
389: Paul "LeoNerd" Evans 2019-02-17 Write the version into the .pc file at 'make install' time so we don't get@VERSION@ from source
390: Paul "LeoNerd" Evans 2019-02-19 {v0.21} Bumped VERSION to 0.21
391: Paul "LeoNerd" Evans 2019-02-19 Bugfix to missing TERMIOS support
392: Paul "LeoNerd" Evans 2019-02-19 Fix offbyone buffer overflow in sprintf calculation of key names (neovim #9630)
393: Paul "LeoNerd" Evans 2019-02-19 {v0.21.1} Remove a pointless (and warny) cast

Our local patches are now part of the libtermkey repo and get removed.

Remove libuv-overlapped.patch since UV_OVERLAPPED_PIPE was included in
libuv v1.21.0:
https://github.com/libuv/libuv/commit/62a0f763a7d1a5bbaa2670b9d2687ba183d2c528

Notable changes since v1.12:
- 1.16.0
  - uv_os_getppid(): get parent PID
  - "win,tty: improve SIGWINCH support" (v1.15.0)
- 1.18.0
  - uv_os_getpid()
- 1.19.0
  - Windows: uv_kill() pid 0 now means "current process group", like unix.
    https://github.com/libuv/libuv/commit/890eedaf59cea75faaa6a14b4248a472dcadb831
- 1.20.0
  - unix,spawn: respect user stdio flags for new pipe
    https://github.com/libuv/libuv/commit/c409b3fcff51ea270724e4f43866764e65666095

In the 20180331 release, the format was slightly changed:

> 20180331
>         + improve terminfo write/read by modifying the fourth item of the
>           extended header to denote the number of valid strings in the extended
>           string table (prompted by a comment in unibilium's sources).

Since the number of valid string capabilities is not necessarily the
same as extstrslen, it's not possible to sanity check the total number
of items up front anymore.

Not needed after libvterm commit:
https://github.com/neovim/libvterm/commit/487f21dbf65f1c28962fef3f064603f415fbaeb2

Only includes the tools needed for Neovim: xgettext, msgfmt, and
msgmerge.

The escape sequence `\e` is non-standard and not supported by MSVC.
It caused the terminal emulator to incorrectly interpret certain keys.

This will be used e.g. by the python client for native asyncio support