patch 7.4.988

Problem:    Default test target is test49.out.
Solution:   Add a build rule before including Make_all.mak.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    988,
 /**/
     987,
 /**/