Our regex would only ever capture a single digit, so versions that had
more than one digit per section would lose additional digits.
Fixes and moves the helper to a cmake file to be shared between
GuestLibs and HostLibs.
Uses the fix in xcb because Fedora ships an older version that doesn't
have some of FEX's newer symbols.
Forgot to initialize CBDone to false before the helper thread is
started.
This fixes an issue where an XCB context is created, then stopped, then
another is created but immediately exits because CBDone was still true
from the previous run.
Also adds the handler for `xcb_connect_to_fd` so we don't miss that
usage.
Notably, xcb_take_socket uses the callback_guest annotation, since the
given callback is never called on the host (instead it's manually forwarded
back to a helper guest thread for calling).
Ryan Houdek