That error looks to be saying that you're trying to load a 64-bit ELF shared object into a 32-bit perl binary (you can tell by the i386-linux-thread-multi bit of the path to DynaLoader). My guess is that your OS upgrade didn't downgrade the OS' perl to 32-bit; presuming this aarch4p is something you've built locally prossibly you were using another (possibly locally compiled) 64-bit perl somewhere else that is (due to your OS patching, the phase of the moon, yadda yadda yadda) no longer being found on your PATH. So either figure out where that other 64-bit perl went and point your PATH to find it, or recompile/reinstall the aarch4p module with the 32-bit perl you're trying to use now.

Update: Additionally this is why you pretty much never want to use the OS' perl install for your application because you're at the vendor's whim WRT upgrades / downgrades / sidegrades. Always compile your own "application" copy of perl somewhere separate (perlbrew is useful for this) and point things at that rather than /usr/bin/perl.