Fix Windows MSVC build regression from GitHub!261
Fix Windows MSVC build regression from GitHub!261

The change to add MinGW support to CTS broke the build for
MSVC on Windows.

https://github.com/KhronosGroup/VK-GL-CTS/pull/261

Components: Framework

Affects: No tests, just compile with MSVC.
GitHub issue: 125

https://github.com/KhronosGroup/VK-GL-CTS/issues/125

Change-Id: I060d5625461cb2d831585b32fe5f1c9336aeea8f

KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS