igvm: Only build stubs if igvm is enabled Change meson script to only include the IGVM stubs file if the IGVM feature is enabled. It is used to handle architecture specific differences within the IGVM backend, not to provide stubs of the backend itself. Signed-off-by: Oliver Steffen <osteffen@redhat.com> Message-ID: <20260130054714.715928-9-osteffen@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>