Failing tests with WITH_BREAKING_CHANGES

I have the following in `config.mak`:

----
DEVELOPER=1
CC=clang
GENERATE_COMPILATION_DATABASE=yes
WITH_RUST=1
USE_ASCIIDOCTOR=1
WITH_BREAKING_CHANGES=1
----

In this configuration, I've noticed some tests failing:

----
t0014-alias.sh                                   (Wstat: 256 (exited 1) Tests: 23 Failed: 2)
  Failed tests:  4, 8
  Non-zero exit status: 1
t1517-outside-repo.sh                            (Wstat: 256 (exited 1) Tests: 404 Failed: 2)
  Failed tests:  248-249
  Non-zero exit status: 1
----

These don't occur if I remove `WITH_BREAKING_CHANGES=1`, so they appear
to be related to that option.  However, I know we have a CI job for that
case, so it's unclear to me why these tests are failing; perhaps the CI
job is not testing what we think it's testing.

I noticed this because I plan to send out a series soon based on that
option and obviously I want to run the testsuite first.
-- 
brian m. carlson (they/them)
Toronto, Ontario, CA

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