sqlite3: Vendor import of sqlite3 3.39.0

Changes at https://www.sqlite.org/releaselog/3_39_0.html.

Obtained from https://www.sqlite.org/2022/sqlite-autoconf-3390000.tar.gz

MFC after: 1 month

Merge commit '2380f7c9781e64d137f0712a8fb185dee648ed8c' into new_merge

MFV r345988:

Update sqlite3-3.26.0 (3260000) --> sqlite3-3.27.1 (3270100)

MFC after: 2 weeks

Import sqlite3 3.12.1

Update sqlite-3.7.17 -> 3.8.5

Introduce svnlite so that we can check out our source code again.

This is actually a fully functional build except:
* All internal shared libraries are static linked to make sure there
is no interference with ports (and to reduce build time).
* It does not have the python/perl/etc plugin or API support.
* By default, it installs as "svnlite" rather than "svn".
* If WITH_SVN added in make.conf, you get "svn".
* If WITHOUT_SVNLITE is in make.conf, this is completely disabled.

To be absolutely clear, this is not intended for any use other than
checking out freebsd source and committing, like we once did with cvs.

It should be usable for small scale local repositories that don't
need the python/perl plugin architecture.