tests: fix "make check-qtest" for modular builds

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200710203652.9708-2-kraxel@redhat.com>

tests/qtest/Makefile.include

@@ -277,6 +277,7 @@ tests/qtest/tco-test$(EXESUF): tests/qtest/tco-test.o $(libqos-pc-obj-y)
 tests/qtest/virtio-ccw-test$(EXESUF): tests/qtest/virtio-ccw-test.o
 tests/qtest/display-vga-test$(EXESUF): tests/qtest/display-vga-test.o
 tests/qtest/qom-test$(EXESUF): tests/qtest/qom-test.o
+tests/qtest/modules-test$(EXESUF): tests/qtest/modules-test.o
 tests/qtest/test-hmp$(EXESUF): tests/qtest/test-hmp.o
 tests/qtest/machine-none-test$(EXESUF): tests/qtest/machine-none-test.o
 tests/qtest/device-plug-test$(EXESUF): tests/qtest/device-plug-test.o