patch 7.4.1512

Problem:    Channel input from file not supported on MS-Windows.
Solution:   Implement it. (Yasuhiro Matsumoto)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1512,
 /**/
     1511,
 /**/