package/libhdhomerun: new package

Needed for new kodi-pvr-hdhomerun package.

[Thomas: use TARGET_MAKE_ENV, other minor tweaks.]

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>