maintainer-feedback requested: [Bug 242352] devel/ruby-gems: Add framework to handle man pages installed by gem

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Bug 242352: devel/ruby-gems: Add framework to handle man pages installed by gem
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242352



--- Description ---
* When devel/ruby-gems is installed
  - Make directories for man pages ${PREFIX}/${GEMS_MAN_DIR}/man[1-9].
  - Add above directory to man path.
* If rubygem ports installs manuals, set their path (relative to
  ${PREFIX}) to GEM_MANUALS_SEC[1-9] in Makefile.
* If GEM_MANUALS_SEC[1-9] isn't empty, Mk/Use/gem.mk do following jobs
  - Create relative symbolic links from
    ${PREFIX}/${GEMS_MAN_DIR}/man[1-9] to real path to each man pages.
  - Add symbolic links to plist.

This patch is based on my proposal in bug #241555, comment #11.