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Windows compilers are not

Windows compilers are not limited to MSVC/MinGW (Intel, clang /very different flavours on Windows/, PGI, Wacom....).
Although most compilers *should* mimics to some of mainstream ones, I'm not sure they really does it (right way and in all versions)

So, WIN32 is defined manually while building LibRaw to indicate that Win32-like environment is present.

We're open to patches: if someone wants to accurately replace #ifdef WIN32 to something better (to work automatically with most common compilers), we'll happily use this patch (too late for 0.19, but in future version)

-- Alex Tutubalin @LibRaw LLC