undefined symbols when compiling with mold linker

When using the mold linker, all of Kea compiles fine, except for lease_query:

make[6]: Entering directory 'kea/premium/src/hooks/dhcp/lease_query/libloadtests'
CXXLD    libdhcp_lease_query_unittests
mold: error: undefined symbol: isc::db::test::VALID_READONLY_DB
>>> referenced by generic_host_data_source_unittest.cc
>>>               ../../../../../../src/lib/dhcpsrv/testutils/.libs/libdhcpsrvtest.a(libdhcpsrvtest_la-generic_host_data_source_unittest.o):(isc::dhcp::test::GenericHostDataSourceTest::testReadOnlyDatabase(char const*))
mold: error: undefined symbol: isc::db::test::VALID_NAME
>>> referenced by generic_host_data_source_unittest.cc
>>>               ../../../../../../src/lib/dhcpsrv/testutils/.libs/libdhcpsrvtest.a(libdhcpsrvtest_la-generic_host_data_source_unittest.o):(isc::dhcp::test::GenericHostDataSourceTest::testReadOnlyDatabase(char const*))
mold: error: undefined symbol: isc::db::test::VALID_HOST
>>> referenced by generic_host_data_source_unittest.cc
>>>               ../../../../../../src/lib/dhcpsrv/testutils/.libs/libdhcpsrvtest.a(libdhcpsrvtest_la-generic_host_data_source_unittest.o):(isc::dhcp::test::GenericHostDataSourceTest::testReadOnlyDatabase(char const*))
mold: error: undefined symbol: isc::db::test::VALID_READONLY_USER
>>> referenced by generic_host_data_source_unittest.cc
>>>               ../../../../../../src/lib/dhcpsrv/testutils/.libs/libdhcpsrvtest.a(libdhcpsrvtest_la-generic_host_data_source_unittest.o):(isc::dhcp::test::GenericHostDataSourceTest::testReadOnlyDatabase(char const*))
mold: error: undefined symbol: isc::db::test::connectionString[abi:cxx11](char const*, char const*, char const*, char const*, char const*, char const*, char const*, char const*, char const*, char const*, char const*)
>>> referenced by generic_host_data_source_unittest.cc
>>>               ../../../../../../src/lib/dhcpsrv/testutils/.libs/libdhcpsrvtest.a(libdhcpsrvtest_la-generic_host_data_source_unittest.o):(isc::dhcp::test::GenericHostDataSourceTest::testReadOnlyDatabase(char const*))
mold: error: undefined symbol: isc::db::test::VALID_PASSWORD
>>> referenced by generic_host_data_source_unittest.cc
>>>               ../../../../../../src/lib/dhcpsrv/testutils/.libs/libdhcpsrvtest.a(libdhcpsrvtest_la-generic_host_data_source_unittest.o):(isc::dhcp::test::GenericHostDataSourceTest::testReadOnlyDatabase(char const*))
collect2: error: ld returned 1 exit status

Adding this line in src/hooks/dhcp/lease_query/libloadtests/Makefile.am solves it:

libdhcp_lease_query_unittests_LDADD  += $(top_builddir)/src/lib/database/testutils/libdatabasetest.la

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