gobject-introspection: GI_SCANNER_DISABLE_CACHE environment variable

[Richard PALO <richard.palo%baou.fr@localhost>]

Just a heads up...

debugging webkit-gtk I came across a disturbing tidbit that 
gobject-introspection uses by default $HOME/.cache/g-ir-scanner for a cache.

It would seem prudent for pkgsrc users to include the environment 
variable `GI_SCANNER_DISABLE_CACHE=yes` in their Makefiles or patches.

https://bugzilla.gnome.org/show_bug.cgi?id=649054

Guess by default I'll take myself webkit-gtk*.

Looks like quite a few packages use gobject-introspection, at least :
> audio/rhythmbox-gtk3/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> chat/libfolks/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> chat/telepathy-glib/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> devel/at-spi2-core/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> devel/atk/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> devel/libgee/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> devel/libgee0.8/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> devel/libpeas/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> devel/libwnck3/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> devel/lua-gi/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> devel/pango/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> devel/py-gobject-shared/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> devel/py-gobject3/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> devel/ruby-gnome2-gobject-introspection/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> editors/gedit3/Makefile.common:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> graphics/gdk-pixbuf2/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> graphics/goocanvas2/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> multimedia/gst-plugins0.10-base/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> multimedia/gst-plugins1-base/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> multimedia/gstreamer0.10/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> multimedia/gstreamer1/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> multimedia/ruby-gnome2-gstreamer/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> net/gssdp/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> net/gupnp-av/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> net/gupnp-dlna/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> net/gupnp/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> net/libsoup24/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> security/libsecret/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> www/webkit-gtk/Makefile.common:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> x11/gnome-desktop3/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> x11/gtk2/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> x11/gtk3/Makefile:.include "../../devel/gobject-introspection/buildlink3.mk"
> x11/gtksourceview3/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"
> x11/libdesktop-agnostic/Makefile:.include 
> "../../devel/gobject-introspection/buildlink3.mk"