Compiler error C2099 when trying to compile GLAD2 Vulkan 1.3 in MSVC compiler
![image](https://user-images.githubusercontent.com/41929176/153060042-12235c38-8897-4401-a98c-b46c9dbc0e37.png)

This issue is resolved with simple change in #357 . 
It is a simple C template change which changes `static const type value;` into `#define (type)value` in those cases it was emiting a warning.
