box64: add package

[agorgl]

Adds box64 util package for aarch64 targets.
This will allow running x86_64 windows games through wine in the future.

Tested by writing and compiling this sample program in my x86_64 machine:

> cat main.c
#include <stdio.h>

int main(int argc, char *argv[])
{
    printf("hello there, I'm a x86_64 program\n");
    return 0;
}
> gcc -o sample main.c
> ./sample
hello there, I'm a x86_64 program

then copying it over to my raspberry pi 4b running batocera that includes the box64 package and running:

# box64 sample
[BOX64] Box64 arm64 v0.4.0 nogit with Dynarec built on Feb 27 2026 07:37:30
[BOX64] Dynarec for ARM64, with extension: ASIMD CRC32
[BOX64] Running on Cortex-A72 with 4 cores, pagesize: 4096
[BOX64] Will use hardware counter measured at 54.0 MHz emulating 3.4 GHz
[BOX64] Didn't detect 48bits of address space, considering it's 39bits
[BOX64] Counted 23 Env var
[BOX64] Library search path:
[BOX64] Binary search path: ./:bin/:/bin/:/sbin/:/usr/bin/:/usr/sbin/
[BOX64] Looking for sample
[BOX64] Dynarec for ARM64, with extension: ASIMD CRC32
[BOX64] Running on Cortex-A72 with 4 cores, pagesize: 4096
[BOX64] Will use hardware counter measured at 54.0 MHz emulating 3.4 GHz
[BOX64] Rename process to "sample"
[BOX64] Using native(wrapped) libc.so.6
[BOX64] Using native(wrapped) ld-linux-x86-64.so.2
[BOX64] Using native(wrapped) libpthread.so.0
[BOX64] Using native(wrapped) libdl.so.2
[BOX64] Using native(wrapped) libutil.so.1
[BOX64] Using native(wrapped) libresolv.so.2
[BOX64] Using native(wrapped) librt.so.1
[BOX64] Using native(wrapped) libbsd.so.0
hello there, I'm a x86_64 program

# lsmod | grep -i bin
# mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
# lsmod | grep -i bin
binfmt_misc            16384  1
# while IFS= read -r line; do echo $line > /proc/sys/fs/binfmt_misc/register; done <<<"$(grep -v '^#' /etc/binfmt.d/box64.conf)"

# ./sample
[BOX64] Box64 arm64 v0.4.0 nogit with Dynarec built on Feb 27 2026 07:37:30
[BOX64] Dynarec for ARM64, with extension: ASIMD CRC32
[BOX64] Running on Cortex-A72 with 4 cores, pagesize: 4096
[BOX64] Will use hardware counter measured at 54.0 MHz emulating 3.4 GHz
[BOX64] Didn't detect 48bits of address space, considering it's 39bits
[BOX64] Counted 23 Env var
[BOX64] Library search path:
[BOX64] Binary search path: ./:bin/:/bin/:/sbin/:/usr/bin/:/usr/sbin/
[BOX64] Looking for ./sample
[BOX64] Dynarec for ARM64, with extension: ASIMD CRC32
[BOX64] Running on Cortex-A72 with 4 cores, pagesize: 4096
[BOX64] Will use hardware counter measured at 54.0 MHz emulating 3.4 GHz
[BOX64] Rename process to "sample"
[BOX64] Using native(wrapped) libc.so.6
[BOX64] Using native(wrapped) ld-linux-x86-64.so.2
[BOX64] Using native(wrapped) libpthread.so.0
[BOX64] Using native(wrapped) libdl.so.2
[BOX64] Using native(wrapped) libutil.so.1
[BOX64] Using native(wrapped) libresolv.so.2
[BOX64] Using native(wrapped) librt.so.1
[BOX64] Using native(wrapped) libbsd.so.0
hello there, I'm a x86_64 program

[agorgl]

I have also tested running the windows x86_64 game teeworlds through x86_64 wine (wine-tkg-staging build), that is wrapped by box64 binfmt, and it seems to work fine on my raspberry pi 4b!

[agorgl]

Added configuration flags for the rest of the supported targets and included the package to the system utilities group for the non x86_any targets