Fix non amd64 build

[freyes]

No description provided.

[freyes]

The snap produced with this patch builds correctly on aarch64, although when running qemu-img it segfaults:

$ octavia-diskimage-retrofit jammy-server-cloudimg-arm64.img octavia.img
/snap/octavia-diskimage-retrofit/x7/bin/retrofit.sh: line 81: 395388 Illegal instruction     (core dumped) qemu-img convert -O raw $INPUT_IMAGE $TEMP_IMAGE_FILE

Looking at ldd's output seems to have correctly linked:

$ ldd /snap/octavia-diskimage-retrofit/current/usr/bin/qemu-img
        linux-vdso.so.1 (0x0000ffff97277000)
        liburing.so.2 => /snap/octavia-diskimage-retrofit/current/usr/lib/aarch64-linux-gnu/liburing.so.2 (0x0000ffff96770000)
        libglib-2.0.so.0 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libglib-2.0.so.0 (0x0000ffff96620000)
        libgmodule-2.0.so.0 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libgmodule-2.0.so.0 (0x0000ffff96600000)
        libgnutls.so.30 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libgnutls.so.30 (0x0000ffff96400000)
        libm.so.6 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libm.so.6 (0x0000ffff96360000)
        libzstd.so.1 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libzstd.so.1 (0x0000ffff96290000)
        libz.so.1 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libz.so.1 (0x0000ffff96260000)
        libaio.so.1 => /snap/octavia-diskimage-retrofit/current/usr/lib/aarch64-linux-gnu/libaio.so.1 (0x0000ffff96240000)
        libc.so.6 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff96090000)
        /lib/ld-linux-aarch64.so.1 (0x0000ffff9723a000)
        libpcre.so.3 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libpcre.so.3 (0x0000ffff96010000)
        libp11-kit.so.0 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libp11-kit.so.0 (0x0000ffff95ec0000)
        libidn2.so.0 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libidn2.so.0 (0x0000ffff95e90000)
        libunistring.so.2 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libunistring.so.2 (0x0000ffff95cd0000)
        libtasn1.so.6 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libtasn1.so.6 (0x0000ffff95ca0000)
        libnettle.so.8 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libnettle.so.8 (0x0000ffff95c40000)
        libhogweed.so.6 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libhogweed.so.6 (0x0000ffff95be0000)
        libgmp.so.10 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libgmp.so.10 (0x0000ffff95b50000)
        libffi.so.8 => /snap/core22/current/usr/lib/aarch64-linux-gnu/libffi.so.8 (0x0000ffff95b30000)