sys-process/criu: Fix passing arch to fix build on arm64

sys-process/criu: Fix passing arch to fix build on arm64

Upstream wants to do the aarch64 replacement themselves, so don't pass aarch64
in the ebuild, otherwise we end up with the following type error:

make -j8 -l10 CC=aarch64-unknown-linux-gnu-gcc LD=aarch64-unknown-linux-gnu-ld OBJCOPY=aarch64-unknown-linux-gnu-objcopy LIBDIR=/usr/lib64 ARCH=aarch64 V=1 WERROR=0 DEBUG=0 SETPROCTITLE=no PYCRIU=no all docs
Makefile:29: *** "The architecture aarch64 isn't supported".  Stop.

Package-Manager: portage-2.3.0