Ruby

object.c: fix exponent with underscore

• object.c (rb_cstr_to_dbl_raise): do not ignore exponent part
  when the input string longer than internal buffer contains
  underscore(s). [ruby-core:86836] [Bug #14731]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63322 b2dd03c8-39d4-4d8f-98ff-823fe69b080e