orc: new package

Orc - the Oil Runtime Compiler - is the successor of liboil.
There's a runtime library that is installed in staging and target
and there's a host version that can be built if orcc, the ORC
compiler is needed at build time.

[Peter: minor tweaks]
Signed-off-by: Sven Neumann <s.neumann@raumfeld.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>