Log Message:
Update graphics/ruby-RMagick package to 1.9.1 applying patch from
PR pkg/31251 provided by Akio Obata.

RMagick 1.9.1
o Fixed bug #2157, Image#total_colors is now an alias of Image#number_colors
o Fixed bug #2155, Image#dispose= now accepts a DisposeType enum, #dispose
  now returns a DisposeType enum.
o Fixed bug #2156, Image#properties no longer returns garbage for the property
  name and value.
o Fixed bug #2190, Image#compose now returns a CompositeOperator
o Fixed bug #2191, Image#composite no longer abends when called
  with 0 arguments
o Fixed bug #2213, ImageList#montage method no longer leaves the imagelist
  corrupt after raising an ImageMagickError
o Feature #2159, added GrayChannel ChannelType enum value, BlendCompositeOp
  and ColorBurnCompositeOp CompositeOperator enum values, RLECompression
  CompressionType enum value, deprecate RunlengthCompression
o Feature #2172, added optional argument to crop and crop! to reset the saved
  page offsets after cropping
o Deprecated Image#channel_threshold. This method is deprecated in ImageMagick.
o Feature #2373, change Image#import_pixels to accept a pixel data buffer
  as well as a pixel data array. (Thanks to Ara T. Howard for this suggestion!)
o Fixed to compile without errors with ImageMagick 6.2.4-4.