Development/rpc (#1595)

* [Tests/unit/core] : Fix build 'test_rpc'.

- 'Announcements' was removed in 'a3d08b81dc5b192a0952ad8c0ccfc3a94bc08339'

- Missing dependency library specification resulted in undefined symbol.

* [Tests/unit/core] : Ensure valid pointer in 'test_rpc'.

Tests/unit/core/test_rpc.cpp

@@ -282,6 +282,8 @@ namespace Tests {
           // Create remote instance of "IAdder".
           Exchange::IAdder * adder = client->Open<Exchange::IAdder>(_T("Adder"));
 
+          ASSERT_TRUE(adder != nullptr);
+
           // Perform some arithmatic.
           EXPECT_EQ(adder->GetValue(), static_cast<uint32_t>(0));
           adder->Add(20);