Use appropriate numpy int type for platform

Author: mrkn

spec/pycall/pytypeobject_wrapper_spec.rb

@@ -14,7 +14,12 @@ module PyCall
       specify do
         expect(PyCall.builtins.tuple === PyCall.tuple()).to eq(true)
         np = PyCall.import_module('numpy')
-        expect(np.int64 === np.asarray([1])[0]).to eq(true)
+        case RUBY_PLATFORM
+        when /mingw32/
+          expect(np.int32 === np.asarray([1])[0]).to eq(true)
+        else
+          expect(np.int64 === np.asarray([1])[0]).to eq(true)
+        end
         expect(np.integer === np.asarray([1])[0]).to eq(true)
       end
     end