When using the result of find_program, meson may expand
it to include both an interpretor path and the script
path. If we then add the interpretor path too, we fail.
Using 'full_path()' ensures we get only the script path.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The positional parameter used to be treated as 'input', but since we
already set 'input' explicitly it is redundant. With latest meson
versions it now generates an error
data/meson.build:4:7: ERROR: Function does not take positional arguments.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
