add mutex_simple, semaphore_producer_consumer example.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@522 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/kernel/SConscript

@@ -17,6 +17,8 @@ semaphore_static.c
 semaphore_dynamic.c
 semaphore_priority.c
 semaphore_buffer_worker.c
+semaphore_producer_consumer.c
+mutex_simple.c
 heap_malloc.c
 heap_realloc.c
 """)