remove unused code, mostly imports

src/runtime/test_primitive_types.zig

@@ -16,8 +16,6 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-const std = @import("std");
-
 // TODO: use functions instead of "fake" struct once we handle function API generation
 const Primitives = struct {
     pub fn constructor() Primitives {