Fix warning by adding missing delete operator functions

Also override new/delete operators to call in FreeRTOS malloc/free in
the freeRTOS example app.

Change-Id: I08c0780c907e5fe90ccb1679869d3f41c87c2731
diff --git a/applications/freertos/main.cpp b/applications/freertos/main.cpp
index 1e71e7f..d579944 100644
--- a/applications/freertos/main.cpp
+++ b/applications/freertos/main.cpp
@@ -59,6 +59,34 @@
 #endif
 
 /****************************************************************************
+ * Override new operators to call in FreeRTOS allocator
+ ****************************************************************************/
+
+void *operator new(size_t size) {
+    return pvPortMalloc(size);
+}
+
+void *operator new[](size_t size) {
+    return pvPortMalloc(size);
+}
+
+void operator delete(void *ptr) {
+    vPortFree(ptr);
+}
+
+void operator delete(void *ptr, std::size_t) {
+    vPortFree(ptr);
+}
+
+void operator delete[](void *ptr) {
+    vPortFree(ptr);
+}
+
+void operator delete[](void *ptr, std::size_t) {
+    vPortFree(ptr);
+}
+
+/****************************************************************************
  * InferenceJob
  ****************************************************************************/
 
diff --git a/applications/message_handler/main.cpp b/applications/message_handler/main.cpp
index 8db9e0b..73eb398 100644
--- a/applications/message_handler/main.cpp
+++ b/applications/message_handler/main.cpp
@@ -98,10 +98,18 @@
     vPortFree(ptr);
 }
 
+void operator delete(void *ptr, std::size_t) {
+    vPortFree(ptr);
+}
+
 void operator delete[](void *ptr) {
     vPortFree(ptr);
 }
 
+void operator delete[](void *ptr, std::size_t) {
+    vPortFree(ptr);
+}
+
 /****************************************************************************
  * Mutex & Semaphore
  ****************************************************************************/