rb_w32_ugetcwd: UTF-8 version getcwd * dir.c (rb_dir_getwd): convert from UTF-8. * win32/win32.c (w32_getcwd): codepage aware getcwd using GetCurrentDirectoryW. potential memory leak * dir.c (rb_dir_getwd): get rid of potential memory leak. * util.c (ruby_getcwd): ditto. file.c: realpath in OS path encoding * dir.c (rb_dir_getwd_ospath): return cwd path in the OS path encoding. * file.c (rb_realpath_internal): work in the OS path encoding load.c: cwd encoding * load.c (rb_get_expanded_load_path): save cwd cache in OS path encoding, to get rid of unnecessary conversion and infinite loading when it needs encoding conversion. [ruby-dev:50221] [Bug #13863]
merge revision(s) 58745,58780,59040,60743: [Backport #13863]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62784 b2dd03c8-39d4-4d8f-98ff-823fe69b080e