vim-patch:8.1.0091: MS-Windows: Cannot interrupt gdb when program is running

Problem:    MS-Windows: Cannot interrupt gdb when program is running.
Solution:   Add debugbreak() and use it in the terminal debugger.
            Respect 'modified' in a prompt buffer.
4551c0a9fc

src/nvim/eval.lua

@@ -82,6 +82,7 @@ return {
     ctxset={args={1, 2}},
     ctxsize={},
     cursor={args={1, 3}},
+    debugbreak={args={1, 1}},
     deepcopy={args={1, 2}},
     delete={args={1,2}},
     deletebufline={args={2,3}},