netsurf.browser: add the infamous -fcommon compiler flag

  ++ optional (uilib == "gtk3") gtk3

  ;

  # Since at least 2018 AD, GCC and other compilers run in `-fno-common` mode as

  # default, in order to comply with C standards and also get rid of some bad

  # quality code. Because of this, many codebases that weren't updated need to

  # be patched -- or the `-fcommon` flag should be explicitly passed to the

  # compiler

  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85678

  # https://github.com/NixOS/nixpkgs/issues/54506

  env.NIX_CFLAGS_COMPILE = "-fcommon";

  preConfigure = ''

    cat <<EOF > Makefile.conf

    override NETSURF_GTK_RES_PATH  := $out/share/