patch 7.4.1260
Problem:    The channel feature doesn't work on Win32 GUI.
Solution:   Use WSAGetLastError(). (Ken Takata)
diff --git a/src/vim.h b/src/vim.h
index 18610f5..02f3036 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -519,7 +519,7 @@
 # ifdef HAVE_SYS_POLL_H
 #  include <sys/poll.h>
 #  define HAVE_POLL
-# elif defined(WIN32) && !defined(FEAT_GUI_W32)
+# elif defined(WIN32)
 #  define HAVE_SELECT
 # else
 #  ifdef HAVE_POLL_H