unknown capability 'Smulx'

Hello,

Thank you for this terminfo! But I've run into a small problem: on macOS (terminal is Alacritty), when running the  `tic` command, I see the following:
```
❯ tic tmux-256color.terminfo
"tmux-256color.terminfo", line 48, col 20, terminal 'tmux-256color': unknown capability 'Smulx'
```
It seems to work however.


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With regards,

Angelo Machils