Add very preliminary support for 16-bit segmented relocations. This
does not handle segmented programming in any kind of
programmer-friendly way, but it is the beginning to something
testable.
(Prototype) binutils:
URL: https://github.com/hjl-tools/binutils-gdb
Branch: users/hjl/16bit
Signed-off-by: H. Peter Anvin <hpa@zytor.com>