Log message:
Update ruby-SDL to 2.2.0.

version 2.2.0
Add following constants
  (thanks to oscdir for SDL::GL::*, thanks to Rafael Sevilla for SDL::Event::*)
* SDL::Event::APPMOUSEFOCUS
* SDL::Event::APPINPUTFOCUS
* SDL::Event::APPACTIVE
* SDL::GL::STEREO
* SDL::GL::MULTISAMPLEBUFFERS
* SDL::GL::MULTISAMPLESAMPLES
* SDL::GL::ACCELERATED_VISUAL
* SDL::GL::SWAP_CONTROL
Add following methods(thanks to soutaro)
* SDL::TTF#hinting
* SDL::TTF#hinting=
Rename  SDL::Mixer::Wave.destroyed_ to SDL::Mixer::Wave.destroyed? (thanks to \ 
akicho8)

version 2.1.3.1
Change the name of the option for bundled SGE
Change the way of workaround for -Dmain=SDL_main on Windows platform

version 2.1.3
Fix following methods
* SDL::TTF#draw*
Update documents
Fix compilation problem on FreeBSD(Thanks Rusmir Dusko)
Fix codes about multi-thread
Bundle SGE(Please do not use this bundled SGE if you have other way to use SGE)

version 2.1.2
Improbe the handling of strings
Fix following methods
* SDL::Surface#draw_bezier
Update documents

Log message:
Fix typo, s/GEM_CLEANBUOLD_EXTENSIONS/GEM_CLEANBUILD_EXTENSIONS/.

Log message:
Build fix with ruby21.

Log message:
Add an GEM_EXTSDIR entry for rubygem 2.2 (Ruby 2.1.1).

Log message:
Utilize GEM_NAME in PLIST.

Log message:
Try to fix the fallout caused by the fix for PR pkg/47882. Part 3:

Recursively bump package revisions again after the "freetype2" and
"fontconfig" handling was fixed.

Log message:
Bump freetype2 and fontconfig dependencies to current pkgsrc versions,
to address issues with NetBSD-6(and earlier)'s fontconfig not being
new enough for pango.

While doing that, also bump freetype2 dependency to current pkgsrc
version.

Suggested by tron in PR 47882

Log message:
Fix build problem with ruby193-base-1.9.3p327 (Ruby 1.9.3 patchlevel 327).

Log message:
Recursive bump for removal of jpeg/tiff/png buildlink3.mk files
from SDL_image. If one of these packages needs them, it should
include them itself.

Log message:
Recursive bump for graphics/freetype2 buildlink addition.