Fix test programs to build on more platforms.

Add a bunch of compiler checks to define various macros for attributes
to be assigned to functions and variables.

The Single UNIX Specification says inet_addr() returns (in_addr_t)(-1)
on an error; check for that, as INADDR_NONE isn't defined on all UN*Xes.
(Microsoft's documentation says inet_addr() returns INADDR_NONE, but
that's probably just -1 or 0xffffffff.)

Check whether we have sys/select.h and, if we don't, include sys/time.h
instead; some older UN*Xes don't have sys/select.h.

Get rid of some unused #defines in Win32/Include/Gnuc.h.

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