OK, so I just changed their pthread_self stub to use pthread_t and its
fine.  So I'd just have libX11 use -lpthread for its private thread
library and -lpthread-stubs for xthreadlib, right?
I'd disable the pthread stubs in libX11 also.

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"The frivolity and boredom which unsettle the established order, the
vague foreboding of something unknown, these are the heralds of
approaching change.  The gradual crumbling that left unaltered the
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_Phenomenology of Spirit_ 5:11