build: run vcs.initsubmodules() on host as well
build: run vcs.initsubmodules() on host as well

otherwise, e.g. triple-t metadata in a submodule will not be available
on the host and thus not be used at all

fdroidtravis/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver