ccanlint: fix error with --target=build

It requires that we build the objects first.

tools/ccanlint/compulsory_tests/build.c

@@ -80,4 +80,4 @@ struct ccanlint build = {
 	.can_run = can_build,
 };
 
-REGISTER_TEST(build, &depends_built, &build_objs, NULL);
+REGISTER_TEST(build, &build_objs, NULL);

tools/ccanlint/compulsory_tests/check_build.c

@@ -90,4 +90,4 @@ struct ccanlint check_build = {
 	.can_run = can_build,
 };
 
-REGISTER_TEST(check_build, &build, NULL);
+REGISTER_TEST(check_build, &build, &depends_built, NULL);