updated for version 7.4.498

Problem:    Typo in DOS makefile.
Solution:   Change exists to exist. (Ken Takata)

src/testdir/Make_dos.mak

@@ -87,7 +87,7 @@ clean:
 	-if exist Xfind rd /s /q Xfind
 	-if exist viminfo del viminfo
 	-del test.log
-	-if exists benchmark.out del benchmark.out
+	-if exist benchmark.out del benchmark.out
 
 .in.out:
 	-if exist $*.failed del $*.failed

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    498,
 /**/
     497,
 /**/