* dir.c (rb_dir_getwd): convert from UTF-8.

* win32/win32.c (w32_getcwd): codepage aware getcwd using
  GetCurrentDirectoryW.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58745 b2dd03c8-39d4-4d8f-98ff-823fe69b080e