Fix extraclean in a different way for info+lib/sys

* (extraclean):
* lib/ (extraclean): Use rmdir but suppress any
error indication.  That way, ‘make extraclean’ will remove the
directory if it’s empty, and successfully do nothing otherwise.
1 job for master in 57 minutes and 55 seconds (queued for 2 seconds)
Status Job ID Name Coverage
failed #2311


Name Stage Failure
test-all Test
Makefile:318: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1