trunk has some empty directories. ok to remove?
gcc/testsuite/go.test/test/fixedbugs/bug478.dir libstdc++-v3/testsuite/experimental/string_view/requirements/exception libstdc++-v3/testsuite/experimental/string_view/capacity/wchar_t libstdc++-v3/testsuite/experimental/string_view/capacity/char
