Add abort to stddef calling exit(-1)

include/stdlib.c

@@ -524,6 +524,12 @@ void exit(int status)
 	}
 }
 
+void abort(void)
+{
+	exit(-1);
+}
+
+
 extern struct Heap {
 	Heap	*	next, * end;
 }	HeapNode;

include/stdlib.h

@@ -37,6 +37,8 @@ long labs(long n);
 
 void exit(int status);
 
+void abort(void);
+
 void * malloc(unsigned int size);
 
 void free(void * ptr);