ncurses: Add alacritty terminfo

ncurses: Add alacritty terminfo

This installs alacritty terminal info alongside other terminal emulator
information.

```
$ ls /usr/share/terminfo/a
alacritty  ansi  ansi80x25  ansis  aterm
```

Alacritty is a relatively popular new terminal emulator. Without this,
users need to use workarounds like `export TERM=xterm` to get terminal
escape sequences to work (most of alacritty matches xterm/etc).

Some true-color features do not work correctly with `TERM=xterm` though.

Signed-off-by: Peter Delevoryas <peter@pjd.dev>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>