cannot compile included juce with recent gcc

[shimpe]

e.g. In member function ‘juce::uint8& juce::PixelARGB::getAlpha()’: ../juce_5_3_2/JuceLibraryCode/modules/juce_graphics/colour/juce_PixelFormats.h:116:77: error: cannot bind packed field ‘((juce::PixelARGB*)this)->juce::PixelARGB::.juce::PixelARGB::::comps[3]’ to ‘juce::uint8&’ {aka ‘unsigned char&’} 116 | forcedinline uint8& getAlpha() noexcept { return comps [indexA]; }