kiss: make KISS_FORCE bypass build dependency checks

[aabacchus]

Perhaps this is not desired, or it should use a different environment variable, but it puzzles me that KISS_FORCE=1 skips dependency checks for kiss i and kiss r, but not kiss b.

I would find this useful, for example, when testing building against a different provider of a library or testing if a dependency is unneeded. It's easy to work around without this by editing the depends file though.

Thoughts?

[dilyn-corner]

I don't see an obvious down-side... @git-bruh ?

[git-bruh]

Seems fine, I forgot why I reacted with -1