patch 7.4.1026

Problem:    When using MingW the tests do not clean up all files.  E.g. test
            17 leaves Xdir1 behind. (Michael Soyka)
Solution:   Also delete directories, like Make_dos.mak.  Delete files after
            directories to reduce warnings.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1026,
 /**/
     1025,
 /**/