vim-patch:8.1.0069: cannot handle pressing CTRL-C in a prompt buffer

Problem:    Cannot handle pressing CTRL-C in a prompt buffer.
Solution:   Add prompt_setinterrupt().
0e5979a6d4

src/nvim/eval.lua

@@ -244,6 +244,7 @@ return {
     prevnonblank={args=1},
     printf={args=varargs(1)},
     prompt_setcallback={args={2, 2}},
+    prompt_setinterrupt={args={2, 2}},
     prompt_setprompt={args={2, 2}},
     pum_getpos={},
     pumvisible={},