Add various fixes to enable us to build a selection of useful USB plugins.
Also, skip tests that don't make sense on WIN32 or that will not work.
With much help from Mario Limonciello <mario.limonciello@dell.com> -- Thanks!
During startup we do 1898 persistent allocations to load the quirk files, which
equates to ~90kb of RSS. Use libxmlb to create a mmap'able store we can query
with XPath queries at runtime.
This speeds up matching for GUIDs by about 90%, taking the query from 3.17ms to
about 0.33ms on my Thinkpad. This is more important for slow ARM hardware,
where strcmp() is more expensive than on x64.
The libxmlb library is much faster to query, and does not require the daemon
to parse the XML metadata at startup. It's a zero-copy mmap design that is more
modern and less clunky.
RSS has reduced from 3Mb (peak 3.61Mb) to 1Mb (peak 1.07Mb) and the startup
time has gone from 280ms to 250ms.
