send detailed log for failing libdispatch test to stdout

If VERBOSE is set, the automake test harness used by libdispatch
will cat the log file for any failing testcase to stdout. This will
enable the detailed output from the failed test cases to be captured
by the CI system in the console log, enabling better test failure
diagnosis.

Author: dgrove-oss

utils/build-script-impl

@@ -2604,7 +2604,7 @@ for host in "${ALL_HOSTS[@]}"; do
                 LIBDISPATCH_BUILD_DIR=$(build_directory ${host} ${product})
                 echo "--- Running tests for ${product} ---"
                 with_pushd "${LIBDISPATCH_BUILD_DIR}" \
-                    call make check
+                    call env VERBOSE=1 make check
                 echo "--- Finished tests for ${product} ---"
                 continue
                 ;;