Use $libexecdir and $libdir as appropriate so the files are packaged correctly
when libexecdir != $libdir/$BPN.
(From OE-Core rev: 53c5a6b97f254725ae5d19af4977486ab84d1ea5)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>