Log Message:
Update ruby-kgio to 2.9.3.

=== kgio 2.9.3 - minor cleanups and fixes / 2015-01-12 08:46 UTC

  Most notably there's a new RB_GC_GUARD to fix an occasional segfault at
  load time for Ruby 1.8 users thanks to Petr Novodvorskiy for reporting
  the issue.

  There's been a new mailing list for a few months now at:

      kgio-public@bogomips.org

  No subscription is required, but if you wish to subscribe
  (existing librelist subscribers must resubscribe)

      kgio-public+subscribe@bogomips.org

  There's also a bunch of code cleanups and packaging
  cleanups.  Our website is faster now thanks to olddoc:

      http://bogomips.org/kgio/

  shortlog:

        test/lib_read_write: fix trywritev blocking test
        new mailing list info: kgio-public@bogomips.org
        relax license to allow LGPLv2.1 or later
        gemspec: modernize for more recent rubygems
        doc: switch to olddoc
        remove references to rubyforge and ancient Rubies
        TODO: updates for the future of kgio
        tryopen: add RB_GC_GUARD for Ruby 1.8
        LICENSE: prefer URL to FSF address
        cleanup packaging harder
        fixup -Wshorten-64-to-32 warnings
        cleanup: avoid shadowing rb_str_subseq
        cleanup: avoid shadowing rb_ary_subseq
        pkg.mk: synchronize with my other projects
        gemspec: remove invalid rdoc_options
        gemspec: use SPDX license abbreviation