Proposal 277 is on the topic of a psuedo calling convention for windows, where on x86 you need to use `stdcall`, but on x86_64 it should be `ccall`. The base and Win32 packages both use extensive amounts of CPP to work around this. 

This proposal is to add a `winapi` calling convention that does the right thing regardless of the platform architecture.

With the caveat that I am not well versed in FFI or Windows, my recommendation is to accept. This is a very small proposal that can immediately be used to clean up over 650 CPP invocations throughout the ecosystem. It's clearly a problem that people are running into, and we should focus on easy quality of life improvements.

Best,

Sandy

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