Add defines to put the storage for a DispatchLoaderDynamic in a DLL.

tests/DispatchLoaderDynamicSharedLibrary/DispatchLoaderDynamicSharedLibrary.cpp

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+// Copyright(c) 2020, NVIDIA CORPORATION. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// VulkanHpp Samples : DispatchLoaderDynamic
+//                     Compile test on DispatchLoaderDynamic functions
+
+#include "vulkan/vulkan.hpp"
+
+VULKAN_HPP_DEFAULT_DISPATCH_LOADER_DYNAMIC_STORAGE