Re-add selinux/selinux.h to lxc_container.c

Re-add the selinux header to lxc_container.c since other
functions now use it, beyond the patch that was just
reverted.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/lxc/lxc_container.c

@@ -52,6 +52,10 @@
 # include <blkid/blkid.h>
 #endif
 
+#if WITH_SELINUX
+# include <selinux/selinux.h>
+#endif
+
 #include "virerror.h"
 #include "virlog.h"
 #include "lxc_container.h"