set GTK_PATH so GTK4 finds print and media backends on Linux and OSX #61
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This sets an environmental variable to help GTK4 find print and media backends installed by GTK4_jll on Linux and OSX. Currently this only enables "print to file" but if CUPS is added to Yggdrasil this should enable that too.
Inspired by #60 but does not really fix it.
Amusingly, on Windows printing already seems to work without this.