[Tracker] embedded code copy in tracker is problematic

[Michael Biebl <mbiebl gmail com>]

Hi everyone,

I just noticed that the new tracker 1.6.2 contains a code copy of
sqlite and no longer allows one to use the system sqlite library.
This is problematic for various reasons and distros like Debian [1]
and Fedora strongly discourage such code copies.

Would it be possible to re-add the ability to link against the system
sqlite and only fall back to the embedded copy if the system library
doesn't meet the requirements of tracker (and output a big fat warning
in this case)?

Regards,
Michael

[1] https://wiki.debian.org/EmbeddedCodeCopies
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