.clang-format

win32: do not call GetVolumePathName() with the minimum buffer length

It fails on Windows XP even though the doc says "a safer but slower way to
set the size of the return buffer is to call the GetFullPathName function,
and then make sure that the buffer size is at least the same size as the full
path that GetFullPathName returns."

https://msdn.microsoft.com/en-us/library/windows/desktop/aa364996(v=vs.85).aspx

Well, more "safe" way would be to simply rely on MAX_PATH for common scenarios.

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