[Issue 23935] ImportC for libuv

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23935

--- Comment #1 from a11e99z <black80 at bk.ru> ---
so 1st simple step:
dmd/importc can not eat unsigned __intXX:
    typedef unsigned __int64  uintptr_t;
gives:
Error: missing comma or semicolon after declaration of `__anonymous`, found
`uintptr_t` instead

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