[PATCH] Build with external SQLite

Hi!

I help out with Homebrew maintenance on occasion, and a Homebrew user just
added SQLite support to the `global` formula:
https://github.com/Homebrew/homebrew-core/pull/81424

Because Homebrew generally doesn't use vendored dependencies, and
especially since the SQLite version embedded in `global` is very old, I
devised a patch that allows building with either vendored or external
SQLite, and it passes Homebrew's own tests cleanly. The patch can be found
here:
https://raw.githubusercontent.com/Homebrew/formula-patches/7f944083c7ef9bce55d9e627f5f20bbd5a079b93/global/6.6.7-external-sqlite.patch

Hope that helps assuage concerns from folks who might not be comfortable
using code that has been updated many times since.

Best Regards,
Adrian