patch 7.4.1959

Problem:    Crash when running test_channel.vim on Windows.
Solution:   Check for NULL pointer result from FormatMessage(). (Christian
            Brabandt)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1959,
 /**/
     1958,
 /**/