Re-add PACKAGE=> tests to lib/libc/tests/net/getaddrinfo/Makefile and add
it to lib/libc/tests/sys/Makefile [*]

Even though make -VPACKAGE and make -n install seem to do the right thing,
the effects are a bit different, depending on the build host.

MFC after: 1 week
Obtained from: HardenedBSD (af602f0db) [*]
Reported by: Oliver Pinter <oliver.pinter@hardenedbsd.org> [*]
Sponsored by: Dell EMC Isilon