Install man of slimlock

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

CMakeLists.txt

@@ -235,6 +235,7 @@ endif (BUILD_SHARED_LIBS)
 
 # man file
 install(FILES slim.1 DESTINATION ${MANDIR}/man1/)
+install(FILES slimlock.1 DESTINATION ${MANDIR}/man1/)
 # configure
 install(FILES slim.conf DESTINATION ${SYSCONFDIR})
 # systemd service file