firejail: new package

firejail: new package

Firejail Security Sandbox
https://firejail.wordpress.com/

Lightweight application sandboxing system using seccomp and kernel
namespaces.

Signed-off-by: Chris Frederick <cdf123@cdf123.net>
[Thomas:
 - Fix DEVELOPERS entry: use <> around the e-mail address instead of ()
 - firejail builds fine with musl, so only exclude uclibc, which fails
   to build with EM_ARM undeclared
 - Update to upstream version 0.9.44.8.
 - Remove FIREJAIL_MAKE_OPTS, as suggested by Romain Naour.
 - Pass --enable-busybox-workaround only if Busybox is enabled, as
   suggested by Romain Naour.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>