Add build and test support for NCP on Windows platform. (#740)

tests/unit/test_windows.cpp

@@ -64,6 +64,12 @@ namespace Thread
 // test_message.cpp
 void TestMessage();
 
+// test_ncp_buffer.cpp
+namespace Thread
+{
+    void TestNcpFrameBuffer(void);
+}
+
 // test_timer.cpp
 int TestOneTimer();
 int TestTenTimers();
@@ -117,6 +123,9 @@ namespace Thread
         TEST_METHOD(TestOneTimer) { ::TestOneTimer(); }
         TEST_METHOD(TestTenTimers) { ::TestTenTimers(); }
 
+        // test_ncp_buffer.cpp
+        TEST_METHOD(TestNcpFrameBuffer) { Thread::TestNcpFrameBuffer(); }
+
         // test_toolchain.cpp
         TEST_METHOD(test_packed1) { ::test_packed1(); }
         TEST_METHOD(test_packed2) { ::test_packed2(); }