patch 7.4.1537
Problem:    Too many feature flags for pipes, jobs and channels.
Solution:   Only use FEAT_JOB_CHANNEL.
diff --git a/src/os_mswin.c b/src/os_mswin.c
index 46b3780..2a80381 100644
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -144,7 +144,7 @@
 static HWND s_hwnd = 0;	    /* console window handle, set by GetConsoleHwnd() */
 #endif
 
-#ifdef FEAT_CHANNEL
+#ifdef FEAT_JOB_CHANNEL
 int WSInitialized = FALSE; /* WinSock is initialized */
 #endif
 
@@ -216,7 +216,7 @@
 # ifdef FEAT_OLE
     UninitOLE();
 # endif
-# ifdef FEAT_CHANNEL
+# ifdef FEAT_JOB_CHANNEL
     if (WSInitialized)
     {
 	WSInitialized = FALSE;
@@ -3018,7 +3018,7 @@
 
 #endif /* defined(FEAT_GUI) || defined(FEAT_PRINTER) */
 
-#if defined(FEAT_CHANNEL) || defined(PROTO)
+#if defined(FEAT_JOB_CHANNEL) || defined(PROTO)
 /*
  * Initialize the Winsock dll.
  */