Add Macro in volk.h for custom vulkan.h (etc.) location about volk HOT 4 CLOSED

The intent for supporting this was that if vulkan.h is already included from the custom location, volk won't attempt to include it (see VULKAN_H_ check). So you can use volk as follows:

#include <custom location/vulkan.h>
#include "path/to/volk.h"

This isn't sufficient for compiling volk.c however, unless you compile it as part of another file by including it - so yeah maybe something like VOLK_VULKAN_H_PATH could be a good idea!

from volk.

Ok awesome!
So we need a total of 4 new macros (3 for windows).
I will give it a shot.

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Maybe it's fine to just do this for vulkan.h? The Windows includes are just an optimization; with a custom vulkan.h presumably it's not necessary. So if the macro is defined we'll just include it without the platform handling.

from volk.

Ah ok, yeah that's better!

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