[elf] unify regset and non-regset cases

The only real difference is in filling per-thread notes - getting
the values of registers.   And this is the only part that is worth
an ifdef - we don't need to duplicate the logics regarding gathering
threads, filling other notes, etc.

It would've been hard to do back when regset-based variant had been
introduced, mostly due to sharing bits and pieces of helpers with
aout coredumps.  As the result, too much had been duplicated and
the copies had drifted away since then.  Now it can be done cleanly...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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