macOS 10.7 Quartz patch: gdk/quartz/meson.build: make dependency CoreGraphics optional
Presently, the GDK Quartz build requires that CoreGraphics be available. However, the latter isn't available on 10.7 and earlier, causing build failures.
Make the dependency optional, in meson.build
.
Of note, this patch is what we're currently using in MacPorts.