- force time_t to be 32 bits via Makefile. (If struct u gets changed to not
store a time_t field, this can be removed).
- Latest Windows SDK (supporting Vista) causes a warning due to
a prototype in sys/winnt/nttty. Since we don't actually link with that
function and rely on a DLL find procedure at run time, comment out
the prototype. The function is now officially in the SDK in the
windows header files anyway.
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