Ruby

test_modify_expand.rb: skip if no overflow

• test/-ext-/string/test_modify_expand.rb (test_integer_overflow):
  no longer happens on platforms where size_t is larger than long,
  e.g. 64bit windows, since r57122.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57156 b2dd03c8-39d4-4d8f-98ff-823fe69b080e