We would first not be able to properly detect libxml2 because it's not
automatically found, fix that by explicitly linking against it (and zlib
a dependency). Then if we don't don't define X_OPEN_SOURCE=500, we would
run into the following build error:

clish/shell/shell_execute.c: In function 'clish_shell_exec_action':
clish/shell/shell_execute.c:309:18: error: 'sigignore' undeclared (first
use in this function)
  sa.sa_handler = sigignore; /* Empty signal handler */
                  ^
clish/shell/shell_execute.c:309:18: note: each undeclared identifier is
reported only once for each function it appears in

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Part of a wider housekeeping effort on the packages repository.

Signed-off-by: Alberto Bursi <alberto.bursi@outlook.it>

Signed-off-by: Takashi Umeno <umeno.takashi@gmail.com>

Signed-off-by: Takashi Umeno <umeno.takashi@gmail.com>

The klish is a framework for implementing a CISCO-like CLI on a UNIX
systems. It is configurable by XML files. The KLISH stands for Kommand
Line Interface Shell.

klish is an active fork of the clish program created by Graeme
McKerrell.

Makefile from https://dev.openwrt.org/browser/packages/utils/klish/Makefile?rev=31310

add SOB.
add Maintainer.
change URL http://libcode.org/projects/klish/files
update to 2.1.1 (newest version).
merge klish and konf package.

[squash commits]
Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>
Signed-off-by: Takashi Umeno <umeno.takashi@gmail.com>