rubgem update to 3.2.7

[Koichiro Iwao]

On Mon, Jul 09, 2018 at 12:02:22AM +0200, Walter Schwarzenfeld via freebsd-ports wrote:
> Portmaster tries to build the update in the wrong order.
> 
> Right order for me was (depend on which packages are installed):
> 
> rubygem-glib2
> rubygem-gobject-introspection
> rubygem-gio2
> rubygem-gdk_pixbuf2
> rubygem-pango
> rubygem-gdk3
> 
> rubygem-gtk3
> 
> rubygem-atk

I can also confirm the issue. I always perform portmaster in order that
you shown by hand when rubygem-gtk ports updated. portmaster needs to be fixed.

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