test: check for debug symbols in notmuch

In the future, tests may rely on debug symbols being present in
notmuch, so we plan to switch the default flags.

The main purpose of this test is to help explain the perhaps
mysterious failures of other tests which rely on symbols being
present.

test/T000-basic.sh

@@ -91,4 +91,9 @@ test_expect_equal \
     "$(dirname ${TEST_DIRECTORY})" \
     "$(echo $PATH|cut -f1 -d: | sed -e 's,/test/valgrind/bin$,,')"
 
+test_begin_subtest 'notmuch is compiled with debugging symbols'
+test_subtest_known_broken
+readelf --sections $(which notmuch) | grep \.debug
+test_expect_equal 0 $?
+
 test_done