build: Don't install license or the INSTALL file

Per-distribution packaging usually handles the license, and
INSTALL usually isn't installed to the system at all.
domain-control: fix check for exceeding total column count.
build-sys: check and bail out for explicitly detected missing [f]lex.
build-sys: check and bail out for explicitly detected missing yacc/bison.
domain-control: think harder, Homer ! (more column check fixes).