qca-qt5: fix gcc-11 from upstream
qca-qt5: fix gcc-11 from upstream

Without the change build n `gcc-11` fails as:

    $ nix build --impure --expr 'with import ./. {}; qca-qt5.override { stdenv = gcc11Stdenv; }' -L
    ...
    ...gcc-11.2.0/include/c++/11.2.0/bits/stl_raw_storage_iter.h:69:22: error: expected template-name before '<' token
       69 |     : public iterator<output_iterator_tag, void, void, void, void>
          |                      ^

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs