vk::MemoryBarrier conflicts with winnt.h

Microsoft helpfully defines `MemoryBarrier` to be `__faststorefence` in winnt.h
https://learn.microsoft.com/en-us/windows/win32/api/winnt/nf-winnt-memorybarrier

The effect of this is that if you try to declare a `vk::MemoryBarrier` on windows, MSVC fails to compile with the message:
```
error C2039: '__faststorefence': is not a member of 'vk'
```

Reproduce the Windows/MSVC failure by including winnt.h and declaring vk::MemoryBarrier, then inspect how the Vulkan-Hpp declaration interacts with winnt.h's MemoryBarrier definition. Done means the declaration compiles on Windows without the __faststorefence lookup error.

Written by the indexing model from the issue text.