Improve error message if malloc or realloc fails.

src/misc/alloc.c

@@ -75,7 +75,8 @@ tmalloc(size_t num)
   mutex_unlock(&allocMutex);
 #endif
     if (!s){
-      fprintf(stderr,"malloc: Internal Error: can't allocate %ld bytes. \n",(long)num);
+        fprintf(stderr, "Error: malloc: can't allocate %lld bytes.\n", (long long)num);
+        fprintf(stderr, "    Not enough memory or heap corruption\n");
 #if defined HAS_WINGUI || defined SHARED_MODULE
       controlled_exit(EXIT_FAILURE);
 #else
@@ -119,7 +120,8 @@ trealloc(const void *ptr, size_t num)
 #endif
   }
   if (!s) {
-    fprintf(stderr,"realloc: Internal Error: can't allocate %ld bytes.\n", (long)num);
+    fprintf(stderr,"Error: realloc: can't allocate %lld bytes.\n", (long long)num);
+    fprintf(stderr,"    Not enough memory or heap corruption\n");
 #if defined HAS_WINGUI || defined SHARED_MODULE
       controlled_exit(EXIT_FAILURE);
 #else