Y2038: make __tz_convert compatible with 64-bit-time

Now that __time64_t exists, we can switch internal function
__tz_convert from 32-bit to 64-bit time. This involves switching
some other internal functions and turning some implementations
which use these into wrappers between public 32-bit and internal
64-bit time.

This patch was tested by running 'make check' on branch
master then applying this patch and its two predecessors and
running 'make check' again, and checking that both 'make check'
yield identical results. This was done on x86_64-linux-gnu and
i686-linux-gnu.

	* include/time.h
	(__tz_compute): Replace time_t with __time64_t.
	(__ctime64): Add.
	(__ctime64_r): Likewise.
	(__localtime64): Likewise.
	(__localtime64_r): Likewise.
	(__gmtime64): Likewise.
	(__gmtime64_r): Likewise.
	(__offtime): Replace const time_t* argument with __time64_t.
	(__tz_convert): Likewise.
	* time/ctime.c
	(__ctime64): Add.
	(__ctime): Turn into a wrapper.
	* time/ctime_r.c
	(__ctime64_r): Add.
	(__ctime_r): Turn into a wrapper.
	* time/gmtime.c
	(__gmtime64): Add.
	(__gmtime): Turn into a wrapper.
	(__gmtime64_r): Add.
	(__gmtime_r): Turn into a wrapper.
	* time/localtime.c
	(__localtime64): Add.
	(__localtime): Turn into a wrapper.
	(__localtime64_r): Add.
	(__localtime_r): Turn into a wrapper.
	* time/offtime.c: Replace all time_t occurrences with __time64_t.
	(__offtime): Replace const time_t* argument with __time64_t.
	* time/tzfile.c
	(__tzfile_compute): Adjust __offtime() call arguments.
	* time/tzset.c: Replace all time_t occurrences with __time64_t.
	(__tz_convert): Adjust __tzfile_compute and __tz_compute call arguments.

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