chore(pacman): install some more man pages
chore(pacman): install some more man pages

Because, surprisingly, things like `man 3 strlen` don't work without it.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent