Como Saber Si Soy 32 Bits O 64 Bits

Personally, when I write OpenWrt/LEDE makefiles [for packages], I don't look much at the package's install rules or Makefile ; it usually ends up confusing me, more than helping.
I just look for the binary that the build produces.
In this case I looked for what the build produced in /build_dir/target-mips_24kc_musl/p7zip_16.02/
That's also to say, I'm not completely sure that this works ; but likely it might.