KDGpu spdlog fix

[ssh4net]

For better compatibility with different SPDlog builds, better adda check for SPD build type.
With c++20 no strong reasons to use fmt directly as same author integrated fmt as std::fmt

#if defined(SPDLOG_USE_STD_FORMAT)
template<>
struct KDGPU_EXPORT std::formatter<VkResult> : std::formatter<std::string> {
    template<typename FormatContext>
    auto format(VkResult const &result, FormatContext &ctx) const
    {
        return std::formatter<std::string>::format(getResultAsString(result), ctx);
    }
};
#else
template<>
struct KDGPU_EXPORT fmt::formatter<VkResult> : fmt::formatter<std::string> {
    template<typename FormatContext>
    auto format(VkResult const &result, FormatContext &ctx) const
    {
        return fmt::formatter<std::string>::format(getResultAsString(result), ctx);
    }
};
#endif

[houmain]

Thanks, is this still an issue? I could not reproduce it yet. Neither on Linux nor on Windows.

[ssh4net]

Not sure. But if spdlog is built without fmt but with std::fmt I had this error. So I used this fix.
But after some discussions with some other developers they told me that a std::fmt implementation have worse performance comparing to fmt library (from same author). So thinking to rebuild spdlog to use fmt instead of std