Add optional openssl/vendored dep

[polyzen]

Needed now for static builds.

I don't know if there are cases where one would want to install openssl/vendored or rusqlite/bundled separately. Perhaps they should be combined under a static target?

[codecov[bot]]

Codecov Report

Merging #430 (8f60d87) into master (4ceec66) will not change coverage. The diff coverage is n/a.

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  Hits         1401     1401           
  Misses        240      240           

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[nuxeh]

Hey polyzen!

This seems like a good thing to have, thanks!

Regarding combining them, I think on balance it's better to have the option to have one or the other. I say this because on some platforms (Windows) I found it nigh on impossible to get sqlite dynamic libs, while openssl is somewhat easier, so there it's useful to specifically have the sqlite vendored, I think.

Nothing to suggest there couldn't be an additional static feature, which enables both of these, though. But my question there is, does that in itself make it a static build? I feel there are other steps required to end up with a static binary...

How you are doing your static builds these days? I'd still really like to be able to easily (from a user's perspective) have static builds, even having CI produce binaries for a couple of architectures and attach them to releases.

[nuxeh]

Just saw your messages on IRC, the musl/cargo method does look rather straightforward, hmm

[nuxeh]

So this seems to build just fine statically, thanks again @polyzen

[nuxeh]

Added a note to the readme ea9aa16c60be9b345d2e771d37f2fd296f188b59