Bug#963254: gcc-10: d/rules.def, set AQ to :all for cross build

[YunQiang Su <wzssyqa@gmail.com>]

Package: src:gcc-10
Version: 10.1.0-4

Currently, on i386,
   apt install gcc-10-i686-linux-gnu:amd64

The following packages have unmet dependencies:
 gcc-10-i686-linux-gnu:amd64 : Depends: cpp-10-i686-linux-gnu:amd64 (=
10.1.0-3cross1) but it is not going to be installed
                               Depends: libcc1-0:amd64 (>= 10) but it
is not going to be installed
                               Depends: binutils-i686-linux-gnu:amd64
(>= 2.34) but it is not going to be installed
                               Depends: libgcc-10-dev-i386-cross:amd64
(>= 10.1.0-3cross1) but it is not installable
                               Depends: libc6:amd64 (>= 2.14) but it
is not going to be installed
                               Depends: libgcc-s1:amd64 (>= 3.0) but
it is not going to be installed
                               Depends: libgmp10:amd64 (>= 2:5.0.1~)
but it is not going to be installed
                               Depends: libisl22:amd64 (>= 0.15) but
it is not going to be installed
                               Depends: libmpc3:amd64 but it is not
going to be installed
                               Depends: libmpfr6:amd64 (>= 3.1.3) but
it is not going to be installed
                               Depends: libstdc++6:amd64 (>= 5) but it
is not going to be installed
                               Depends: zlib1g:amd64 (>= 1:1.1.4) but
it is not going to be installed
                               Recommends: libc6-dev-i386-cross:amd64
(>= 2.30-1~)
E: Unable to correct problems, you have held broken packages.

The major problem is  Depends: libgcc-10-dev-i386-cross:amd64 (>=
10.1.0-3cross1) but it is not installable
we need to mark gcc-10-i686-linux-gnu depends on
libgcc-10-dev-i386-cross:all to solve this problem.

-- 
YunQiang Su