Disable Quartz Native Filechooser when running earlier than MacOS X 10.6

Closes: GNOME/gtk#1685
2 jobs from leopard-compat in 9 minutes and 40 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #246561
build

00:09:40

manual #246562
win32 allowed to fail manual
msys2-mingw32