file.c: rb_str_normalize_ospath

* file.c (rb_str_normalize_ospath): extract and move from dir.c.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42430 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
range.c: revert r42400

* range.c (range_last): revert r42400.  [Bug #8739]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42431 b2dd03c8-39d4-4d8f-98ff-823fe69b080e