time: add zone files to $GOROOT

[rsc]

If the tz files are not found in the standrd Unix places,
fall back to looking in $GOROOT.  This is for Windows
and Plan 9.

rsc will do this

[rsc]

Comment 1:

This issue was closed by revision ad17a9c.

Status changed to Fixed.

[peterGo]

Comment 2:

For Windows, use the Windows API and the Windows Registry, not tzdata. By design,
Windows doesn't use tzdata. Windows users update time zone data via Windows update. They
don't expect to have to update tzdata too--they have never heard of it. This introduces
a subtle and pernicious bug on Windows systems.

[rsc]

Comment 3:

Thanks for your concern.  The tzdata is needed only for time.LoadLocation.
The time zone information in the kernel used for time.Local (the local
time zone), but I do not believe it can provide information about other
time zones, and it does not use the standard IANA names.
Only programs that use time.LoadLocation need to worry about the
time zone data file.  If you can implement the same functionality,
using the same location names, with the kernel API alone, then I'd
be happy to review a CL.
Russ