Silence message in latin-ltx about the normal situation

* lisp/leim/quail/latin-ltx.el (latin-ltx--define-rules): Don't
output the summary message unless there are conflicts.
1 job for master in 71 minutes and 24 seconds (queued for 6 seconds)
Status Job ID Name Coverage
failed #2257


Name Stage Failure
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:318: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:957: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1