Add _base variants of Windows Heap API, partially close #638

[Naville]

I'm still not quite sure how the _recalloc implementation works so I kept that part out

[mjp41]

Thanks for doing this. I think your branch is a bit behind main. In particular, I think it is behind #624 which refactored this code to be a bit cleaner. Would you be change in line with that? Thanks

[davidchisnall]

Do you have a link to the documentation for these? I could not find them on MSDN.

[mjp41]

Documentation on this is hard to come by. When I have talked to people they have been unkeen to officially support anything, but they try not to break the tricks other people are using.

PartititonAlloc provides these: https://source.chromium.org/chromium/chromium/src/+/main:base/allocator/partition_allocator/src/partition_alloc/shim/allocator_shim_override_ucrt_symbols_win.h

[Naville]

Do you have a link to the documentation for these? I could not find them on MSDN.

In my use case, without these variants the linker still tries to pull them in from ucrt, which results in duplicate definition error