Drop mod_speex from debian/

Speex is in the core, so Tony dropped the module.
Add core build-dep on libogg-dev for speex
Correct alphabetization
Exit non-zero from build-all on any build failure

./debian/util.sh build-all will do a number of builds in sequence or
parallel.  We now track if any of those builds fail to return a
.changes file and exit non-zero.