Adjust resolv/tst-inet_aton_exact to use tests instead of tests-internal.

Downstream, tests-internal is currently ignored.

diff --git a/resolv/Makefile b/resolv/Makefile

index 0130a09db2d69451..033c3c651f0deb1b 100644

--- a/resolv/Makefile

+++ b/resolv/Makefile

@@ -34,7 +34,7 @@ routines := herror inet_addr inet_ntop inet_pton nsap_addr res_init \

 tests = tst-aton tst-leaks tst-inet_ntop

 xtests = tst-leaks2

-tests-internal += tst-inet_aton_exact

+tests += tst-inet_aton_exact

 generate := mtrace-tst-leaks.out tst-leaks.mtrace tst-leaks2.mtrace