Omit configTOTAL_HEAP_SIZE with Application Allocated Heap

See FreeRTOS#347

Author: Finwood

portable/MemMang/heap_1.c

@@ -58,7 +58,7 @@
 
 /* The application writer has already defined the array used for the RTOS
 * heap - probably so it can be placed in a special segment or address. */
-    extern uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+    extern uint8_t ucHeap[  ];
 #else
     static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
 #endif /* configAPPLICATION_ALLOCATED_HEAP */

portable/MemMang/heap_2.c

@@ -64,7 +64,7 @@ static void prvHeapInit( void );
 
 /* The application writer has already defined the array used for the RTOS
 * heap - probably so it can be placed in a special segment or address. */
-    extern uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+    extern uint8_t ucHeap[  ];
 #else
     static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
 #endif /* configAPPLICATION_ALLOCATED_HEAP */

portable/MemMang/heap_4.c

@@ -61,7 +61,7 @@
 
 /* The application writer has already defined the array used for the RTOS
 * heap - probably so it can be placed in a special segment or address. */
-    extern uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
+    extern uint8_t ucHeap[  ];
 #else
     PRIVILEGED_DATA static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
 #endif /* configAPPLICATION_ALLOCATED_HEAP */