upmpdcli: new package

[Thomas:
 - add package to package/Config.in
 - add missing dependencies on thread and largefile, inherited from
   libupnp. Noticed by Yann E. Morin.
 - add installation of default configuration file. Noticed by Yann
   E. Morin.
 - fix the license, it's not GPLv2, but GPLv2+.
 - remove the colon in the user description, noticed by Yann E. Morin.
 - added a patch to fix build with uClibc.
 - fix the init script installation to use a full path as the target.]

Signed-off-by: Joerg Krause <jkrause@posteo.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>