generator: introduce ability to selectively generate code
generator: introduce ability to selectively generate code

Currently we always generate both the C code and Python code at the same
time. To cope with following changes to the build process, we want to be
able to generate C and Python separately.

Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

libvirt/libvirt-python,libvirt/libvirt-python,libvirt/libvirt-python