ws: workaround for old gdbus-codegen versions
ws: workaround for old gdbus-codegen versions

It turns out that the --output, --body, and --header options are
relatively new, so we can't use them.

Switch to the old style output of multiple files from one invocation.

deryni/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,garrett/cockpit,cockpituous/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,garrett/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,deryni/cockpit,deryni/cockpit,mvollmer/cockpit,garrett/cockpit,mvollmer/cockpit,deryni/cockpit,deryni/cockpit,cockpit-project/cockpit,cockpituous/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,mvollmer/cockpit,martinpitt/cockpit,deryni/cockpit,garrett/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,garrett/cockpit,mvollmer/cockpit,mvollmer/cockpit,cockpituous/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,martinpitt/cockpit,deryni/cockpit,cockpit-project/cockpit