ioquake3: fix riscv cross-compilation (#541598)

pkgs/by-name/io/ioquake3/package.nix

@@ -20,6 +20,7 @@
   mumble,
   unstableGitUpdater,
   bc,
+  buildPackages,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -33,6 +34,11 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-OszPRlS5NTvajDZhtGw2wa275O8YodkIgiBz3POouYs=";
   };
 
+  makeFlags = [
+    "ARCH=${stdenv.hostPlatform.parsed.cpu.name}"
+    "NO_STRIP=1"
+  ];
+
   nativeBuildInputs = [
     copyDesktopItems
     makeBinaryWrapper
@@ -55,6 +61,8 @@ stdenv.mkDerivation (finalAttrs: {
     mumble
   ];
 
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+
   enableParallelBuilding = true;
 
   preConfigure = ''