This cl fixes all issues related to building Vulkan using the x86 compiler in Visual Studio:
- Added dummy function to prevent compiler crash in VkGetProcAddress.cpp
- Added missing WIN32 check in SwiftShader's Vulkan unit tests
- Removed alignment code which broke Win32 DLL. Removing all of it should work on all other
  platforms as well.

Minor nit fix:
- Renamed VkWrapper to VkNonDispatchableHandle, which is a more accurate name.

Bug b/129979580

Change-Id: Ib2bf305433e9aae71ff6f9d796fb86bc7ea733b0
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/31609Tested-by: Alexis Hétu <sugoi@google.com>
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>