py: Clean up instantiation of dupterm object.

To comply with already established scheme for extmod's.

py/mpconfig.h

@@ -819,12 +819,6 @@ typedef double mp_float_t;
 #define MICROPY_PORT_ROOT_POINTERS
 #endif
 
-#if MICROPY_PY_OS_DUPTERM
-#define MP_ROOT_PTR_DUPTERM_OBJ mp_obj_t term_obj
-#else
-#define MP_ROOT_PTR_DUPTERM_OBJ
-#endif
-
 /*****************************************************************************/
 /* Miscellaneous settings                                                    */
 

py/mpstate.h

@@ -127,6 +127,11 @@ typedef struct _mp_state_vm_t {
     MICROPY_PORT_ROOT_POINTERS
 
     // root pointers for extmod
+
+    #if MICROPY_PY_OS_DUPTERM
+    mp_obj_t term_obj;
+    #endif
+
     #if MICROPY_PY_LWIP_SLIP
     mp_obj_t lwip_slip_stream;
     #endif

py/qstrdefs.h

@@ -665,3 +665,7 @@ Q(writeblocks)
 Q(sync)
 Q(count)
 #endif
+
+#if MICROPY_PY_OS_DUPTERM
+Q(dupterm)
+#endif

unix/mpconfigport.h

@@ -253,7 +253,6 @@ void mp_hal_dupterm_tx_strn(const char *str, size_t len);
 #define MICROPY_PORT_ROOT_POINTERS \
     const char *readline_hist[50]; \
     mp_obj_t keyboard_interrupt_obj; \
-    MP_ROOT_PTR_DUPTERM_OBJ; \
     void *mmap_region_head; \
 
 // We need to provide a declaration/definition of alloca()