patch 8.2.1448: test 77a for VMS depends on small.vim which does not exist

Problem:    Test 77a for VMS depends on small.vim which does not exist.
Solution:   Use the 'silent while 0" trick. (issue #6696)

src/testdir/test77a.in

@@ -10,7 +10,11 @@ If it isn't available then the test will be skipped.
 
 VMS does not have CKSUM but has a built in CHECKSUM - it should be used
 STARTTEST
-:so small.vim
+:silent! while 0
+:  e! test.ok
+:  w! test.out
+:  qa!
+:silent! endwhile
 :if !has("vms")
 : e! test.ok
 : w! test.out

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1448,
 /**/
     1447,
 /**/