qmk_firmware: drop

It has not been touched in years, is lacking meta, and is marked as
broken in release-20.09.

pkgs/development/misc/qmk_firmware/default.nix

@@ -1,39 +0,0 @@
-{ stdenv, fetchFromGitHub
-, avrgcc, avrbinutils
-, gcc-arm-embedded, gcc-armhf-embedded
-, teensy-loader-cli, dfu-programmer, dfu-util }:
-
-let version = "0.6.144";
-
-in stdenv.mkDerivation {
-  pname = "qmk_firmware";
-  inherit version;
-  src = fetchFromGitHub {
-    owner = "qmk";
-    repo = "qmk_firmware";
-    rev = version;
-    sha256 = "0m71f9w32ksqjkrwhqwhr74q5v3pr38bihjyb9ks0k5id0inhrjn";
-    fetchSubmodules = true;
-  };
-  postPatch = ''
-    substituteInPlace tmk_core/arm_atsam.mk \
-      --replace arm-none-eabi arm-none-eabihf
-    rm keyboards/handwired/frenchdev/rules.mk keyboards/dk60/rules.mk
-  '';
-  buildFlags = [ "all:default" ];
-  doCheck = true;
-  checkTarget = "test:all";
-  installPhase = ''
-    mkdir $out
-  '';
-  NIX_CFLAGS_COMPILE = "-Wno-error";
-  nativeBuildInputs = [
-    avrgcc
-    avrbinutils
-    gcc-arm-embedded
-    gcc-armhf-embedded
-    teensy-loader-cli
-    dfu-programmer
-    dfu-util
-  ];
-}

pkgs/top-level/aliases.nix

@@ -584,6 +584,7 @@ mapAliases ({
   python2nix = throw "python2nix has been removed as it is outdated. Use e.g. nixpkgs-pytools instead."; # added 2021-03-08
   qca-qt5 = libsForQt5.qca-qt5;  # added 2015-12-19
   qcsxcad = libsForQt5.qcsxcad;  # added 2020-11-05
+  qmk_firmware = throw "qmk_firmware has been removed because it was broken"; # added 2021-04-02
   qr-filetransfer = throw ''"qr-filetransfer" has been renamed to "qrcp"''; # added 2020-12-02
   quake3game = ioquake3; # added 2016-01-14
   qvim = throw "qvim has been removed."; # added 2020-08-31

pkgs/top-level/all-packages.nix

@@ -30591,13 +30591,6 @@ in
 
   pentablet-driver = libsForQt5.callPackage ../misc/drivers/pentablet-driver { };
 
-  qmk_firmware = callPackage ../development/misc/qmk_firmware {
-    avrgcc = pkgsCross.avr.buildPackages.gcc;
-    avrbinutils = pkgsCross.avr.buildPackages.binutils;
-    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
-    gcc-armhf-embedded = pkgsCross.armhf-embedded.buildPackages.gcc;
-  };
-
   new-session-manager = callPackage ../applications/audio/new-session-manager { };
 
   newlib = callPackage ../development/misc/newlib { };