tz: new package

uClibc can not use timezone info from tzdata as-is, but accepts setting
the local timezone in /etc/TZ.

[Peter: strip quotes/use local TZ_LOCALTIME variable]
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
[yann.morin.1998@free.fr: make it a blind package; little tweak to help text]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>