Ruby

re.c: options for sub-regexp

• re.c (rb_reg_to_s): needs embedded options to check syntax of
  sub-regexp. [ruby-core:82328] [Bug #13798]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e