tasknc: fix build with ncurses 6.3

srcpkgs/tasknc/patches/ncurses-6.3.patch

@@ -0,0 +1,36 @@
+From f74ea0641e9bf287acf22fac9f6eeea571b01800 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyich@gmail.com>
+Date: Sat, 6 Nov 2021 11:28:04 +0000
+Subject: [PATCH] src/keys.c: used KEY_EVENT only if it exists
+
+On ncurses-6.3 the build fails as:
+
+    src/keys.c:122:6: error: 'KEY_EVENT' undeclared here (not in a function); did you mean 'KEY_SLEFT'?
+      122 |     {KEY_EVENT, "event"},
+          |      ^~~~~~~~~
+          |      KEY_SLEFT
+
+ncurses-6.3 deprecated KEY_EVENT as:
+
+     * mark wgetch-events feature as deprecated.
+          + prevent  KEY_EVENT  from  appearing  in  curses.h  unless the
+            configure option --enable-wgetch-events is used.
+---
+ src/keys.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/keys.c b/src/keys.c
+index f62bdae..d35e425 100644
+--- a/src/keys.c
++++ b/src/keys.c
+@@ -119,7 +119,10 @@ struct keymap keymaps[] = {
+     {KEY_UNDO, "undo"},
+     {KEY_MOUSE, "mouse"},
+     {KEY_RESIZE, "resize"},
++/* Optional deprecated ncurses feature. */
++#ifdef KEY_EVENT
+     {KEY_EVENT, "event"},
++#endif
+     {1, "C-a"},
+     {2, "C-b"},
+     {3, "C-c"},