ltp: Added zip-native as a DEPENDS

The Makefile checks for zip during installation

[YOCTO #6699]

(From OE-Core rev: a6e8ced3fa8e8e2aa3df0798b80eb26e5ebc4b15)

(Backport to older version 20130503)

Signed-off-by: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>