buildroot

ympd: new package

[Thomas:
 - Add the package to package/Config.in
 - Add dependency on largefile
 - Add new patch to CMakeLists.txt to remove the unused C++ dependency
 - Change the existing CMakeLists.txt patch to simply remove the
   problematic code, and reword the explanation.]

Signed-off-by: Eric Limpens <limpens@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>