patch 7.4.2223

Problem:    Buffer overflow when using latin1 character with feedkeys().
Solution:   Check for an illegal character.  Add a test.

src/testdir/test_regexp_utf8.vim

@@ -92,18 +92,3 @@ func Test_classes_re2()
   call s:classes_test()
   set re=0
 endfunc
-
-func Test_source_utf8()
-  " check that sourcing a script with 0x80 as second byte works
-  new
-  call setline(1, [':%s/àx/--à1234--/g', ':%s/Àx/--À1234--/g'])
-  write! Xscript
-  bwipe!
-  new
-  call setline(1, [' àx ', ' Àx '])
-  source! Xscript | echo
-  call assert_equal(' --à1234-- ', getline(1))
-  call assert_equal(' --À1234-- ', getline(2))
-  bwipe!
-  call delete('Xscript')
-endfunc