Cannot build master on macOS

[Aaron Jensen]

When trying to build master on macOS, it fails with:

cp -f emacs.pdmp bootstrap-emacs.pdmp
cp: emacs.pdmp: No such file or directory
make[1]: *** [emacs.pdmp] Error 1
make: *** [src] Error 2

First bad commit:

commit 4ac6148ef94fed6863c75e73ad91b565ce60cabe
Author: Philipp Stephani <phst@google.com>
Date:   Sat Jan 2 15:04:50 2021 +0100

    Avoid printing stacktraces when it probably wouldn't work anyway.

    * src/eval.c (signal_or_quit): Don't try to call the debugger if it's
    inhibited or we are about to dump or bootstrap.  In those cases the
    debugger probably wouldn't work anyway.

 src/eval.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

Reverting the commit on master allows me to build again.

Aaron