dumpobj, obj2asm, shell should be built for 64 bit

[dlang-bugzilla-migration]

Transferred from: https://issues.dlang.org/show_bug.cgi?id=19664

User @jacob-carlborg reported (2019-Feb-10 10:13:10):

All tools shipped with a DMD release should be built for the same architecture. For a 64 bit release, the following tools are built for 32 bit: "dumpobj", "obj2asm" and "shell". This is extra important for macOS since Mojave is the last release where 32 bit applications will work and with DMD 2.085.0 we have deprecated the support for 32 bit on macOS.

User @jacob-carlborg responded (2019-Jul-14 15:58:38):

Raising this to blocker since the public beta of macOS Catalina is out where 32 bit programs don't run.

CC @WalterBright : Those tools are distributed as by DigitalMars and not actually part of this repository, so you're the only one able to handle this AFAIK.