patch 8.2.1675: MinGW: testdir makefile deletes non-existing file

Problem:    MinGW: testdir makefile deletes non-existing file.
Solution:   Use another way to delete the output file if it already exists.
            (Michael Soyka)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1675,
 /**/
     1674,
 /**/