configure.ac SELinux fixes
configure.ac SELinux fixes

* Fix a logic error in configure.ac that prevented --with-selinux=no
  from being used with --with-secdriver-selinux=no.

* Fix some strings to clarify the difference between --with-selinux
  and --with-secdriver-selinux.

Signed-off-by: Spencer Shimko <8cb1bc922147bedb755dab905e9929eb6ae25d98@tresys.com>
Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

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