PDP-11 bug fix

[Lars Brinkhoff]

Paul Koning writes:
>> https://sourceware.org/bugzilla/show_bug.cgi?id=20694
>
> 256 is clearly not the best value, but the question is whether it
> should be 64 or 8192.  64 would make sense since that is the start
> address and length modulus.

The Unix V6 linker aligns sections to 8192 boundaries; setting the
PDP-11 page size to this value makes GNU ld do the same thing.  See the
Bugzilla issue.