pam_motd: Cleanup the code and avoid unnecessary logging

The pam_motd module will not log if the default motd.d directories
are missing.

Also cleanup some code cleanliness issues and fix compilation
warnings.

* modules/pam_motd/pam_motd.c: Constification of constant strings.
  (try_to_display_directory): Removed unused function.
  (pam_split_string): Replace uint with unsigned int. Fix warnings.
  (compare_strings): Fix warnings by proper constification.
  (try_to_display_directories_with_overrides): Cleanups. Switch
  off the logging if the motd.d directories are missing and they
  are default ones.
  (pam_sm_open_session): Cleanup warnings. Pass the information
  to try_to_display_directories_with_overrides() that non-default
  motd options are used.

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