Add GDK_DPI_SCALE env var
Add GDK_DPI_SCALE env var

This is very useful for hidpi where the dpi is scaled to make
non-dpi aware apps larger. In that case a dpi aware gtk+ using
GDK_SCALE will be getting huge fonts. You can the set GDK_DPI_SCALE
to compensate for this.

jadahl/gtk,jadahl/gtk,jigpu/gtk,bratsche/gtk-,grubersjoe/adwaita,bratsche/gtk-,jadahl/gtk,davidgumberg/gtk,chergert/gtk,jigpu/gtk,jessevdk/gtk,msteinert/gtk,chergert/gtk,chergert/gtk,jessevdk/gtk,alexlarsson/gtk,chergert/gtk,Lyude/gtk-,Adamovskiy/gtk,jadahl/gtk,ahodesuka/gtk,msteinert/gtk,Sidnioulz/SandboxGtk,jigpu/gtk,bratsche/gtk-,grubersjoe/adwaita,Adamovskiy/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,davidgumberg/gtk,jessevdk/gtk,ahodesuka/gtk,jigpu/gtk,davidgumberg/gtk,jessevdk/gtk,ahodesuka/gtk,bratsche/gtk-,chergert/gtk,davidgumberg/gtk,alexlarsson/gtk,ahodesuka/gtk,ebassi/gtk,grubersjoe/adwaita,davidgumberg/gtk,alexlarsson/gtk,ahodesuka/gtk,Sidnioulz/SandboxGtk,alexlarsson/gtk,msteinert/gtk,Lyude/gtk-,alexlarsson/gtk,ahodesuka/gtk,msteinert/gtk,grubersjoe/adwaita,Lyude/gtk-,chergert/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,ebassi/gtk,jigpu/gtk,jadahl/gtk,Lyude/gtk-,Lyude/gtk-,ebassi/gtk,jessevdk/gtk,Sidnioulz/SandboxGtk,grubersjoe/adwaita,msteinert/gtk,Adamovskiy/gtk,Lyude/gtk-,grubersjoe/adwaita,alexlarsson/gtk,ebassi/gtk,davidgumberg/gtk,grubersjoe/adwaita,grubersjoe/adwaita,Adamovskiy/gtk,ahodesuka/gtk,msteinert/gtk,jadahl/gtk,jigpu/gtk,ahodesuka/gtk,Adamovskiy/gtk,Adamovskiy/gtk,Lyude/gtk-,jigpu/gtk,jessevdk/gtk,bratsche/gtk-,jadahl/gtk,davidgumberg/gtk,ebassi/gtk,bratsche/gtk-,davidgumberg/gtk,alexlarsson/gtk,jigpu/gtk,jessevdk/gtk,Adamovskiy/gtk,ebassi/gtk,Lyude/gtk-,Sidnioulz/SandboxGtk,alexlarsson/gtk,chergert/gtk,chergert/gtk