Libpng multiple inclusion fix


#1

Hey ,

I had a conflict with multiple inclusion of libpng so I had to comment out the extern “C”{ under #ifdef _cplucplus and its following } when def is closing
in files png.h and pngpriv.h and it works .

//sahil


#2

Thanks - interesting point. It probably would make more sense to remove that and keep all the png symbols hidden away inside the juce namespace.