Add conditional dependency on the SCL

Signed-off-by: Jon Ludlam <jonathan.ludlam@citrix.com>
Add oasis from xenserver/buildroot

Signed-off-by: Jon Ludlam <jonathan.ludlam@citrix.com>
SCLify oasis

Signed-off-by: Jon Ludlam <jonathan.ludlam@citrix.com>
Don't use pkg_name in Sources - specdep can get confused

Signed-off-by: Jon Ludlam <jonathan.ludlam@citrix.com>