selinux: Replace hardcoded install path with @prefix@

Replace the hardcoded install path in src/selinux/swtpm.fc and
src/selinux/swtpmcuse.fc with @prefix@ and append .in to these files so
that they are generated when running configure.

Add the selinux policy input files with their suffix to the CLEANFILES
variable so they get cleaned up and 'make distcheck' works.

Resolves: https://github.com/stefanberger/swtpm/issues/711
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
7 files changed