c++: Fix (some) solaris breakage

[Nathan Sidwell]

Jonathan was kind enough to test this fix.  It doesn't address all the 
solaris issues, but does get us further.

Solaris' sys/socket uses the poisoned bcopy identifier,	so we must
#include it before poisoning.  The inclusion happens in	cody.hh, so we
preemptively copy a bit	of cody's inclusion logic to get it earlier.

	gcc/cp/
         * mapper-client.cc: Include sys/socket.h before	system.h.

pushing to trunk
-- 
Nathan Sidwell
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