mandoc: Also run makewhatis for /usr/share/openssl/man

[ivy]

Summary

We use a pkg(8) trigger to run makewhatis for /usr/share/man when
manpages are updated, but this doesn't cover /usr/share/openssl/man.

Rewrite the trigger to process a list of directories instead of a
single directory, and include /usr/share/openssl/man in the list.

MFC after: 3 days

[emaste]

This seems reasonable to me

[emaste]

OK.

Two things feel a bit odd to me ([ -d DIR ] could be done directly in lua I think, and the DIR gsub rather than just using dir inline a few times) but it should function fine.

[ivy]

In D53064#1213503, @emaste wrote:

Two things feel a bit odd to me ([ -d DIR ] could be done directly in lua I think

i am not sure there is a way to check if a directory (or a file) exists in Lua. is there?

[ivy]

use pkg.stat to check for directory existence

also, remove /usr/share/openssl/man/mandoc.db on removal.