Vulkan API (GetProcAddr only)

This patch contains an empty Vulkan shell with only GetProcAddr implemented

Initial version of the VulkanAPI, empty and unimplemented.
Successfully builds vk_swiftshader.dll for all platforms/configuration in Visual Studio.

To test using dEQP:
- Edit environment variables
	- Define VK_ICD_FILENAMES to <SwiftShader's source directory>\src\Vulkan\vk_swiftshader_icd.json
- If the location of vk_swiftshader.dll you're using is different than the one specified in
  src\Vulkan\vk_swiftshader_icd.json, modify it to point to the vk_swiftshader.dll file you want to use

Bug b/116336664

Change-Id: I560b53c3e4340b9c5ccd244a6693ff2f9f994a6f
Reviewed-on: https://swiftshader-review.googlesource.com/20788
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>

src/Vulkan/VkGetProcAddress.h

diff --git a/src/Vulkan/VkGetProcAddress.h b/src/Vulkan/VkGetProcAddress.h
new file mode 100644
index 0000000..c8bfc35
--- /dev/null
+++ b/src/Vulkan/VkGetProcAddress.h
@@ -0,0 +1,25 @@
+// Copyright 2018 The SwiftShader Authors. 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.
+
+#ifndef VK_UTILS_HPP_
+#define VK_UTILS_HPP_
+
+#include <vulkan/vulkan.h>
+
+namespace vk
+{
+	PFN_vkVoidFunction GetProcAddr(const char* pName);
+}
+
+#endif // VK_UTILS_HPP_
\ No newline at end of file