In order to avoid compiling the same source files twice, with and
without the TEST_PROGRAM define.
Tested that the build still works and that `make distcheck` works as
expected.
Tested that the test_* programs in lib/ keep working. (Though they are
not really invoked by `make check` and in particular test_nsutils is
quite useless, test_fileutils also quite poor.)
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
