patch 7.4.1333
Problem:    Channel test fails on non-darwin builds.
Solution:   Add the "osx" feature and test for that. (Kazunobu Kuriyama)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 5a03fcf..6feb137 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -7275,7 +7275,8 @@
 localmap		Compiled with local mappings and abbr. |:map-local|
 lua			Compiled with Lua interface |Lua|.
 mac			Macintosh version of Vim.
-macunix			Macintosh version of Vim, using Unix files (OS-X).
+macunix			Compiled for OS X, with darwin
+osx			Compiled for OS X, with or without darwin
 menu			Compiled with support for |:menu|.
 mksession		Compiled with support for |:mksession|.
 modify_fname		Compiled with file name modifiers. |filename-modifiers|