[packages] zsh: add version 5.0.2

Installs the shell binary, and all applicable completion functions.
Completion functions specific for other systems (e.g. AIX/Solaris/Redhat/etc)
are not installed.

Compiled against ncurses. Notice the "--with-term-lib=..." at Build/Configure
forcing the preference for ncurses (against ncursesw). To build with ncursesw,
(i) change the dependencies, (ii) remove the '--with-term-lib=...' (iii) add
CPPFLAGS=-I$(STAGING_DIR)/usr/include/ncursesw to the configure command.

Signed-off-by: Francisco Borges <francisco.borges@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@35474 3c298f89-4303-0410-b956-a3cf2f4a3e73