bwm_ng: pull upstream fix for upcoming ncurses-6.3

pkgs/tools/networking/bwm-ng/default.nix

···
 , stdenv
 , autoreconfHook
 , fetchurl
+, fetchpatch
 , ncurses
 }:
 
···
     url = "https://www.gropp.org/bwm-ng/${pname}-${version}.tar.gz";
     sha256 = "0ikzyvnb73msm9n7ripg1dsw9av1i0c7q2hi2173xsj8zyv559f1";
   };
+
+  patches = [
+    # Pull upstream fix for ncurses-6.3 support.
+    (fetchpatch {
+      name  = "ncurses-6.3.patch";
+      url = "https://github.com/vgropp/bwm-ng/commit/6a2087db6cc7ac5b5f667fcd17c262c079e8dcf2.patch";
+      sha256 = "1l5dii9d52v0x0sq458ybw7m9p8aan2vl94gwx5s8mgxsnbcmzzx";
+      # accidentally committed changes
+      excludes = [ "config.h.in~" "configure.in" "configure~" ];
+     })
+  ];
 
   nativeBuildInputs = [
     autoreconfHook