'Fix' unused params for remaining functions

particle_test.c

@@ -8,6 +8,7 @@ static const Vector2 GRAVITY = {0, GRAV_ACCEL};
 
 void simple_particle_system_update(Particle_t* part, void* user_data)
 {
+    (void)user_data;
 
     float delta_time = DELTA_T; // TODO: Will need to think about delta time handling
     part->rotation += part->angular_vel;

tests/test_mempool.c

@@ -9,18 +9,24 @@
 
 static int setup_mempool(void** state)
 {
+    (void)state;
+
     init_memory_pools();
     return 0;
 }
 
 static int teardown_mempool(void** state)
 {
+    (void)state;
+
     free_memory_pools();
     return 0;
 }
 
 static void test_simple_get_and_free(void **state)
 {
+    (void)state;
+
     unsigned long idx;
     Entity_t* ent = new_entity_from_mempool(&idx);