fixup! Add a build definition for Azure DevOps

While we do not have the patches in `master` yet that allow skipping the
`git rebase -p` tests, we will have that feature as soon as we rebase to
the v2.20.0 release train.

Let's prepare for that and save a couple of minutes in the Windows phase
by simply not bothering to test the `git rebase -p` mode that will be
deprecated hopefully soon.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

azure-pipelines.yml

@@ -215,8 +215,8 @@ phases:
          . ci/lib.sh
 
          make -j10 DEVELOPER=1 NO_PERL=1 || exit 1
-         NO_PERL=1 NO_SVN_TESTS=1 GIT_TEST_OPTS=\"--no-chain-lint --no-bin-wrappers --quiet --write-junit-xml\" time make -j15 -k DEVELOPER=1 test || {
-           NO_PERL=1 NO_SVN_TESTS=1 GIT_TEST_OPTS=\"-i -v -x\" make -k -C t failed; exit 1
+         NO_PERL=1 NO_SVN_TESTS=1 GIT_TEST_SKIP_REBASE_P=1 GIT_TEST_OPTS=\"--no-chain-lint --no-bin-wrappers --quiet --write-junit-xml\" time make -j15 -k DEVELOPER=1 test || {
+           NO_PERL=1 NO_SVN_TESTS=1 GIT_TEST_SKIP_REBASE_P=1 GIT_TEST_OPTS=\"-i -v -x\" make -k -C t failed; exit 1
          }
 
          save_good_tree