* hires.h: Fix copyright.

	* hires.h: Fix copyright.
	* times.cc: Ditto.
	localtime, gmtime).
	(FACTOR): Add comment.
	(NSPERSEC): Ditto.
	(JITTER): New definition.  Comment.
	(systime_ns): Avoid gratuitous copying of the value returned by
	GetSystemTimeAsFileTime.
	(corelocaltime, localtime, gmtime): Remove very old, unused code block.
	(cygwin_tzset): Remove.
	(hires_ms::timeGetTime_ns): Add missing semicolon in comment.
	(hires_ms::nsecs): Redefine check for difference between internal
	timer value and system time.