Problem: private_selftest is DRAFT but called unconditionally

Solution: wrap it in ifdefs to fix stable-only builds

Author: bluca

zproject_class.gsl

@@ -292,8 +292,10 @@ test_runall (bool verbose)
             continue;
         if (!item->subtest)
             item->test (verbose);
+#ifdef $(PROJECT.PREFIX)_BUILD_DRAFT_API // selftest is still in draft
         else
             $(project.prefix)_private_selftest (verbose, item->subtest);
+#endif // $(PROJECT.PREFIX)_BUILD_DRAFT_API
     }
 
     printf ("Tests passed OK\\n");
@@ -393,8 +395,10 @@ main (int argc, char **argv)
         printf ("Running $(project.name) test '%s'...\\n", test->testname);
         if (!test->subtest)
             test->test (verbose);
+#ifdef $(PROJECT.PREFIX)_BUILD_DRAFT_API // selftest is still in draft
         else
             $(project.prefix)_private_selftest (verbose, test->subtest);
+#endif // $(PROJECT.PREFIX)_BUILD_DRAFT_API
     }
     else
         test_runall (verbose);