spec testsuite fails on IBM s390x system for pcx file format

[mtasaka]

image_size 2.1.1 sees spec testsuite failure on IBM s390x system for pcx file format. Note that s390x system is big endian:

........................
Failures:
  1) ImageSize for spec/images/pcx/70x60.pcx given as data gets format and dimensions
     Failure/Error: expect(image_size).to have_attributes(attributes)
       expected #<ImageSize:0x000002aa0b7a5dc0 @format=:pcx, @width=17665, @height=15105> to have attributes {:format => :pcx, :h => 60, :height => 60, :size => [70, 60], :w => 70, :width => 70} but had attributes {:format => :pcx, :h => 15105, :height => 15105, :size => [17665, 15105], :w => 17665, :width => 17665}
       Diff:
       @@ -1,7 +1,7 @@
        :format => :pcx,
       -:h => 60,
       -:height => 60,
       -:size => [70, 60],
       -:w => 70,
       -:width => 70,
       +:h => 15105,
       +:height => 15105,
       +:size => [17665, 15105],
       +:w => 17665,
       +:width => 17665,
     # ./spec/image_size_spec.rb:35:in `block (5 levels) in <top (required)>'
  2) ImageSize for spec/images/pcx/70x60.pcx given as IO gets format and dimensions
     Failure/Error: expect(image_size).to have_attributes(attributes)
       expected #<ImageSize:0x000002aa0b88cd10 @format=:pcx, @width=17665, @height=15105> to have attributes {:format => :pcx, :h => 60, :height => 60, :size => [70, 60], :w => 70, :width => 70} but had attributes {:format => :pcx, :h => 15105, :height => 15105, :size => [17665, 15105], :w => 17665, :width => 17665}
       Diff:
       @@ -1,7 +1,7 @@
        :format => :pcx,
       -:h => 60,
       -:height => 60,
       -:size => [70, 60],
       -:w => 70,
       -:width => 70,
       +:h => 15105,
       +:height => 15105,
       +:size => [17665, 15105],
       +:w => 17665,
       +:width => 17665,
     # ./spec/image_size_spec.rb:44:in `block (6 levels) in <top (required)>'
     # ./spec/image_size_spec.rb:42:in `open'
     # ./spec/image_size_spec.rb:42:in `block (5 levels) in <top (required)>'
  3) ImageSize for spec/images/pcx/70x60.pcx given as StringIO gets format and dimensions
     Failure/Error: expect(image_size).to have_attributes(attributes)
       expected #<ImageSize:0x000002aa0b8cfc28 @format=:pcx, @width=17665, @height=15105> to have attributes {:format => :pcx, :h => 60, :height => 60, :size => [70, 60], :w => 70, :width => 70} but had attributes {:format => :pcx, :h => 15105, :height => 15105, :size => [17665, 15105], :w => 17665, :width => 17665}
       Diff:
       @@ -1,7 +1,7 @@
        :format => :pcx,
       -:h => 60,
       -:height => 60,
       -:size => [70, 60],
       -:w => 70,
       -:width => 70,
       +:h => 15105,
       +:height => 15105,
       +:size => [17665, 15105],
       +:w => 17665,
       +:width => 17665,
     # ./spec/image_size_spec.rb:57:in `block (5 levels) in <top (required)>'
  4) ImageSize for spec/images/pcx/70x60.pcx given as Tempfile gets format and dimensions
     Failure/Error: expect(image_size).to have_attributes(attributes)
       expected #<ImageSize:0x000002aa0b8aa6f8 @format=:pcx, @width=17665, @height=15105> to have attributes {:format => :pcx, :h => 60, :height => 60, :size => [70, 60], :w => 70, :width => 70} but had attributes {:format => :pcx, :h => 15105, :height => 15105, :size => [17665, 15105], :w => 17665, :width => 17665}
       Diff:
       @@ -1,7 +1,7 @@
        :format => :pcx,
       -:h => 60,
       -:height => 60,
       -:size => [70, 60],
       -:w => 70,
       -:width => 70,
       +:h => 15105,
       +:height => 15105,
       +:size => [17665, 15105],
       +:w => 17665,
       +:width => 17665,
     # ./spec/image_size_spec.rb:72:in `block (6 levels) in <top (required)>'
     # ./spec/image_size_spec.rb:67:in `block (5 levels) in <top (required)>'
  5) ImageSize for spec/images/pcx/70x60.pcx using path method gets format and dimensions
     Failure/Error: expect(image_size).to have_attributes(attributes)
       expected #<ImageSize:0x000002aa0b8ed638 @format=:pcx, @width=17665, @height=15105> to have attributes {:format => :pcx, :h => 60, :height => 60, :size => [70, 60], :w => 70, :width => 70} but had attributes {:format => :pcx, :h => 15105, :height => 15105, :size => [17665, 15105], :w => 17665, :width => 17665}
       Diff:
       @@ -1,7 +1,7 @@
        :format => :pcx,
       -:h => 60,
       -:height => 60,
       -:size => [70, 60],
       -:w => 70,
       -:width => 70,
       +:h => 15105,
       +:height => 15105,
       +:size => [17665, 15105],
       +:w => 17665,
       +:width => 17665,
     # ./spec/image_size_spec.rb:84:in `block (5 levels) in <top (required)>'
Finished in 0.06602 seconds (files took 0.11639 seconds to load)
168 examples, 5 failures
Failed examples:
rspec ./spec/image_size_spec.rb[1:13:1:1] # ImageSize for spec/images/pcx/70x60.pcx given as data gets format and dimensions
rspec ./spec/image_size_spec.rb[1:13:2:1] # ImageSize for spec/images/pcx/70x60.pcx given as IO gets format and dimensions
rspec ./spec/image_size_spec.rb[1:13:3:1] # ImageSize for spec/images/pcx/70x60.pcx given as StringIO gets format and dimensions
rspec ./spec/image_size_spec.rb[1:13:4:1] # ImageSize for spec/images/pcx/70x60.pcx given as Tempfile gets format and dimensions
rspec ./spec/image_size_spec.rb[1:13:5:1] # ImageSize for spec/images/pcx/70x60.pcx using path method gets format and dimensions

[toy]

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