firefox: Fix AArch64 build

 * The 'arm.patch' patch doesn't apply anymore.
 * The 'build-arm-libopus.patch' patch isn't required anymore.
 * See the mozilla phabricator link for the added patch.

Additionally, we are now *always* undconditionally applying all patches
to all architectures. That is, unless they have undesirable
side-effects, but those might not be fit for inclusion.

By applying all patches all the time, they'll be removed or replaced
when they stop applying.

pkgs/applications/networking/browsers/firefox/common.nix

@@ -93,16 +93,12 @@ stdenv.mkDerivation ({
 
   patches = [
     ./env_var_for_system_dir.patch
-  ] ++ lib.optionals (stdenv.isAarch64) [
-    (fetchpatch {
-      url = "https://raw.githubusercontent.com/archlinuxarm/PKGBUILDs/09c7fa0dc1d87922e3b464c0fa084df1227fca79/extra/firefox/arm.patch";
-      sha256 = "1vbpih23imhv5r3g21m3m541z08n9n9j1nvmqax76bmyhn7mxp32";
-    })
-    (fetchpatch {
-      url = "https://raw.githubusercontent.com/archlinuxarm/PKGBUILDs/09c7fa0dc1d87922e3b464c0fa084df1227fca79/extra/firefox/build-arm-libopus.patch";
-      sha256 = "1zg56v3lc346fkzcjjx21vjip2s9hb2xw4pvza1dsfdnhsnzppfp";
-    })
   ]
+  ++ lib.optional (lib.versionAtLeast ffversion "73") (fetchpatch {
+    # https://phabricator.services.mozilla.com/D60667
+    url = "https://hg.mozilla.org/mozilla-central/raw-rev/b3d8b08265b800165d684281d19ac845a8ff9a66";
+    sha256 = "0b4s75w7sl619rglcjmlyvyibpj2ar5cpy6pnywl1xpd9qzyb27p";
+  })
   ++ patches;