anbox, arc_unpacker: fix build after defaulting to gcc12

pkgs/os-specific/linux/anbox/default.nix

@@ -85,8 +85,8 @@ stdenv.mkDerivation rec {
     systemd
   ];
 
-  NIX_CFLAGS_COMPILE = [
-    # Needed with GCC 12
+  # Flag needed by GCC 12 but unrecognized by GCC 9 (aarch64-linux default now)
+  NIX_CFLAGS_COMPILE = lib.optionals (with stdenv; cc.isGNU && lib.versionAtLeast cc.version "12") [
     "-Wno-error=mismatched-new-delete"
   ];
 

pkgs/tools/archivers/arc_unpacker/default.nix

@@ -18,6 +18,7 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     cp ${catch2}/include/catch2/catch.hpp tests/test_support/catch.h
+    sed '1i#include <limits>' -i src/dec/eagls/pak_archive_decoder.cc # gcc12
   '';
 
   checkPhase = ''