pie binaries silently fail without `--auto-zafl-libraries`
Pie binaries need the --auto-zafl-libraries
flag or afl-fuzz fails with a handshake failure, but no indication that it's because zafl didn't insert the fork server. We should be able to detect pie executables vs. libraries in some way and at least report to the user that they need to use the right options.
We could consider adding an option --no-auto-zafl-libraries
and force the user to explicitly use one flag or the other with relocatable files?