thread safety tests

I am wondering why thread_test.c is checking for mktemp()? That function
is nowhere used in the libpq.

Also, I would suggest that we allow to build the libpq with thread
specific compiler options, even if it is not entirely thread safe. It
would require that a really multithreaded application has to have
mutexes around certain operations, but being entirely unable to
configure in a way that adds thread compile options to the CFLAGS makes
libpq completely useless for multithreaded programs on some platforms
(for example Solaris).

Jan

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