make AUTO_BOOTSTRAP=1 fails and suggests to use AUTO_BOOTSTRAP=1

[Andrei Alexandrescu]

I mentioned this in the past, apparently it hasn't been resolved.

Tried to install a dev tree for dmd from complete scratch. So:

$ curl https://raw.githubusercontent.com/dlang/tools/master/setup.sh 
 >/tmp/setup.sh
$ /tmp/setup.sh

The script gets everything from github nice and fast but then fails to 
download 
http://downloads.dlang.org/releases/2.x/2.095.0/dmd.2.095.0.linux.tar.xz 
for some reason.

Anyway, I then try to run:

$ cd dmd
$ make AUTO_BOOTSTRAP=1 -f posix.mak

As mentioned in the title, the command fails and confusingly suggest 
using AUTO_BOOTSTRAP=1, which is already there.

If the plan is to give up boostrapping, fine but let's eliminate the 
code. The way things are now we both pay for the technical debt and we 
don't profit from it.

Of course it would be much better if bootstrapping actually worked.