VAX: drop OBJ_VMS leftovers

OBJ_VMS support was dropped almost 20 years ago (e330299ed5ee). Drop
respective code from tc-vax.c as well.

While there, make adjustments for OBJ_ELF as well: -K was dropped over
20 years ago (530556a951f5), yet left in md_shortopts. OPTION_PIC isn't
really necessary either; 'k' can be used instead. And then the ELF
options available weren't displayed by md_show_usage().
2 files changed