[Citadel Development] Patch: Nullify tcp buffering on OS X

[matt]

I've found the cause of the slow TCP IPC connections bug on OS X, namely buffering output on the socket will cause the system to wait too long to spit out the results. Changes: * Check for OSX/Darwin in configure and define accordingly (HAVE_DARWIN) * Created stub functions for buffer_output, unbuffer_output, flush_output in sysdep.c

sysdep.c.diff
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configure.ac.diff
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acconfig.h.diff
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