global: call XInitThreads() from the library's constructor

There is really no point in not being thread safe, I measured, all you
can see happen is noop performance gets like twice as slow and you have
thread safety bugs. And we're using xcb as the transport which means we
should expect threads in our clients anyway. Just do it.

This assumes your compiler understands __attribute__((constructor)). If
this is not your compiler, you can disable this with the appropriate
configure flag, but be aware you're asking for bugs.

Signed-off-by: Adam Jackson <ajax@redhat.com>
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