refactor to deal with it. The "SYMLINKS" prerequisite is currently
excluded as so much relies on it, but this might change in the future.
-GIT_TEST_GETTEXT_POISON=<non-empty?> turns all strings marked for
-translation into gibberish if non-empty (think "test -n"). Used for
+GIT_TEST_GETTEXT_POISON=<boolean> turns all strings marked for
+translation into gibberish if true. Used for
spotting those tests that need to be marked with a C_LOCALE_OUTPUT
prerequisite when adding more strings for translation. See "Testing
marked strings" in po/README for details.