tzdata: update to 2015d

Changes affecting future time stamps

Egypt will not observe DST in 2015 and will consider canceling it
permanently.  For now, assume no DST indefinitely.
(Thanks to Ahmed Nazmy and Tim Parenti.)

Changes affecting past time stamps
America/Whitehorse switched from UTC-9 to UTC-8 on 1967-05-28, not
1966-07-01.  Also, Yukon's time zone history is documented better.
(Thanks to Brian Inglis and Dennis Ferguson.)

Change affecting past and future time zone abbreviations
The abbreviations for Hawaii-Aleutian standard and daylight times
have been changed from HAST/HADT to HST/HDT, as per US Government
Printing Office style.  This affects only America/Adak since 1983,
as America/Honolulu was already using the new style.

(From OE-Core rev: b9f366ab)

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>