This reverts commit 47bca2f0.  I worry very much
when some --with-distro=foo due to a typo doesn't do what I'd expect, and the
non-fatal error message scrolled by so quickly nobody would notice.

Conflicts:
	autogen.sh

Change-Id: I8e0938e28e5aa23b59c82bbd10db0018e32a44dd
Reviewed-on: https://gerrit.libreoffice.org/37701Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Jenkins <ci@libreoffice.org>