brogue: pull upstream fix for -fno-common toolchains

Without the change build fails on upstream gcc-10 as:

    ld: src/brogue/Time.o:/build/brogue-1.7.5/src/brogue/IncludeGlobals.h:51:
      multiple definition of `messageArchive'; src/brogue/Architect.o:/build/brogue-1.7.5/src/brogue/IncludeGlobals.h:51: first defined here

pkgs/games/brogue/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, SDL, ncurses, libtcod, makeDesktopItem }:
+{ lib, stdenv, fetchurl, fetchpatch, SDL, ncurses, libtcod, makeDesktopItem }:
 
 stdenv.mkDerivation rec {
   pname = "brogue";
@@ -8,6 +8,15 @@ stdenv.mkDerivation rec {
     url = "https://sites.google.com/site/broguegame/brogue-${version}-linux-amd64.tbz2";
     sha256 = "0i042zb3axjf0cpgpdh8hvfn66dbfizidyvw0iymjk2n760z2kx7";
   };
+  patches = [
+    # Pull upstream fix for -fno-common toolchains:
+    #  https://github.com/tmewett/BrogueCE/pull/63
+    (fetchpatch {
+      name = "fno-common.patch";
+      url = "https://github.com/tmewett/BrogueCE/commit/2c7ed0c48d9efd06bf0a2589ba967c0a22a8fa87.patch";
+      sha256 = "19lr2fa25dh79klm4f4kqyyqq7w5xmw9z0fvylkcckqvcv7dwhp3";
+    })
+  ];
 
   prePatch = ''
     sed -i Makefile -e 's,LIBTCODDIR=.*,LIBTCODDIR=${libtcod},g' \