thunderbird: fix build after rustc update

pkgs/applications/networking/mailreaders/thunderbird/default.nix

@@ -50,6 +50,14 @@ in stdenv.mkDerivation rec {
   patches = [
     # Remove buildconfig.html to prevent a dependency on clang etc.
     ./no-buildconfig.patch
+
+    # Needed on older branches since rustc: 1.32.0 -> 1.33.0
+    (fetchurl {
+      name = "missing-documentation.patch";
+      url = "https://aur.archlinux.org/cgit/aur.git/plain/deny_missing_docs.patch"
+          + "?h=firefox-esr&id=03bdd01f9cf";
+      sha256 = "1i33n3fgwc8d0v7j4qn7lbdax0an6swar12gay3q2nwrhg3ic4fb";
+    })
   ];
 
   configureFlags =
@@ -66,7 +74,7 @@ in stdenv.mkDerivation rec {
       "--with-system-libevent"
       "--with-system-png" # needs APNG support
       "--with-system-icu"
-      "--enable-rust-simd"
+      #"--enable-rust-simd" # not supported since rustc 1.32.0 -> 1.33.0; TODO: probably OK since 68.0.0
       "--enable-system-ffi"
       "--enable-system-hunspell"
       "--enable-system-pixman"