Added _GNU_SOURCE for uClibc-ng compatibility. _XOPEN_SOURCE does not
seem to be enough.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

sigignore is missing from libc.

Signed-off-by: Rosen Penev <rosenp@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>