tidy up ok help

-m, -s, and -w are now vias.

No real need to advertise -h given that if you just run ok with no
arguments it prints the help, but to be friendly accept -h and --help.

Change-Id: Id23936106cfea7d670cf0eb9773a5851055576f1
Reviewed-on: https://skia-review.googlesource.com/13254
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed