Bruce Evans eb51e37703 Remove some unnecessary #includes.
Restore the simple leap year calculation as a macro and document it so
that it doesn't become complicated again.  The simple version works
for all leap years covered by 32-bit time_t's.  The complicated version
doesn't work for all leap years covered by 64-bit time_t's since among
other reasons, the solar system is not stable for long enough.

Fix declarations.

Nuke spinwait().
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