dlclose is a no-op on musl. Test will always fail.
--- apr-1.6.2/test/testdso.c.old 2010-01-03 19:35:07.000000000 -0600
+++ apr-1.6.2/test/testdso.c 2017-09-10 18:43:43.374983090 -0500
@@ -244,7 +244,7 @@
abts_run_test(suite, test_load_module, NULL);
abts_run_test(suite, test_dso_sym, NULL);
abts_run_test(suite, test_dso_sym_return_value, NULL);
- abts_run_test(suite, test_unload_module, NULL);
+ /* abts_run_test(suite, test_unload_module, NULL); */
#ifdef LIB_NAME
apr_filepath_merge(&libname, NULL, LIB_NAME, 0, p);
@@ -252,7 +252,7 @@
abts_run_test(suite, test_load_library, NULL);
abts_run_test(suite, test_dso_sym_library, NULL);
abts_run_test(suite, test_dso_sym_return_value_library, NULL);
- abts_run_test(suite, test_unload_library, NULL);
+ /* abts_run_test(suite, test_unload_library, NULL); */
#endif
abts_run_test(suite, test_load_notthere, NULL);