vim-patch:7.4.1051

Problem:    Segfault when unletting "count".
Solution:   Check for readonly and locked first. (Dominique Pelle)
            Add a test.

af8af8bfac

src/nvim/version.c

@@ -642,7 +642,7 @@ static int included_patches[] = {
   1054,
   1053,
   1052,
-  // 1051,
+  1051,
   1050,
   1049,
   1048,