Merge target arm case with other "easy" cases. Add target
cases a29k-*-none (rehack of am29k), a29k-*-kern (remote to
Ultracomputer kernel), and a29k-*-sym1 (ultracomputer OS's user
process).
* configure.in, Makefile.in: Avoid rebuilding "depend" as much.
Avoid declaring Makefile dependencies, because GNU Make stupidly
tries to update it if we do.
* coffread.c: Revise for minor changes to bfd internal coff
indexes.
* configure: If -template= is given a relative path, make it
absolute before recurring in subdirectories.
