make all-go && MES=guile ./pre-inst-env scripts/mescc -m64 -c scaffold/main.c
* lib/x86_64-mes/elf64-header.hex2: New file. * lib/x86_64-mes/elf64-footer-single-main.hex2: New file. * build-aux/build-x86_64-mes.sh: Enable second, objdump'able exit-42 scaffold test.