The trees as shipped come with /usr/etc, which should just be labeled
as usr_t. When we do a deployment, we need to relabel the copies of
the files we're making in /etc.
SELinux support is compile and runtime optional.
The Makefile.dist-packaging lives canonically in rpm-ostree/ for now,
it's my latest hack to automate git -> (s)rpm.
Update the spec.in from current Fedora.