vulkan: Fix MSVC build
Three additional issues:
- Pointer math on void* not standard
-
__alignof__not a standard keyword, but macros.h hasalignof - MSVC's
_Alignof/__alignofonly works on types, not values
/cc @robclark @jekstrand
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Three additional issues:
__alignof__ not a standard keyword, but macros.h has alignof
_Alignof/__alignof only works on types, not values/cc @robclark @jekstrand