fix compiler warning on __STDC_FORMAT_MACROS redef

kazuho / picojson

a header-file-only, JSON parser serializer in C++

BSD 2-Clause "Simplified" License

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Open NikolausDemmel opened 4 years ago

NikolausDemmel commented 4 years ago

Fixes #91

Without this, if I include 2 libraries that define this macro, I get warnings like

warning: '__STDC_FORMAT_MACROS' macro redefined [-Wmacro-redefined]

This is on macos 10.15 with AppleClang 11.