[interp] fix unused variable warnings (#11365)
```
interp/interp.c:2337:17: warning: unused variable 'entry_funcs_static' [-Wunused-variable]
static gpointer entry_funcs_static [MAX_INTERP_ENTRY_ARGS + 1] = { INTERP_ENTRY_FUNCLIST (static) };
^
interp/interp.c:2338:17: warning: unused variable 'entry_funcs_static_ret' [-Wunused-variable]
static gpointer entry_funcs_static_ret [MAX_INTERP_ENTRY_ARGS + 1] = { INTERP_ENTRY_FUNCLIST (static_ret) };
^
interp/interp.c:2339:17: warning: unused variable 'entry_funcs_instance' [-Wunused-variable]
static gpointer entry_funcs_instance [MAX_INTERP_ENTRY_ARGS + 1] = { INTERP_ENTRY_FUNCLIST (instance) };
^
interp/interp.c:2340:17: warning: unused variable 'entry_funcs_instance_ret' [-Wunused-variable]
static gpointer entry_funcs_instance_ret [MAX_INTERP_ENTRY_ARGS + 1] = { INTERP_ENTRY_FUNCLIST (instance_ret) };
^
4 warnings generated.
```