[build] build gtk-sharp from svn, fix up .configs
[build] build gtk-sharp from svn, fix up .configs

The gtk/gdk-sharp-2.0 assembly config files map to the x11 variant
of the GDK/GTK native libraries, so after make install we change
them to map to quartz.

ixfalia/banshee,directhex/banshee-hacks,stsundermann/banshee,mono-soc-2011/banshee,petejohanson/banshee,Dynalon/banshee-osx,babycaseny/banshee,petejohanson/banshee,mono-soc-2011/banshee,allquixotic/banshee-gst-sharp-work,mono-soc-2011/banshee,allquixotic/banshee-gst-sharp-work,Carbenium/banshee,babycaseny/banshee,Carbenium/banshee,ixfalia/banshee,Carbenium/banshee,petejohanson/banshee,petejohanson/banshee,stsundermann/banshee,dufoli/banshee,directhex/banshee-hacks,GNOME/banshee,babycaseny/banshee,Dynalon/banshee-osx,Dynalon/banshee-osx,mono-soc-2011/banshee,dufoli/banshee,arfbtwn/banshee,Dynalon/banshee-osx,dufoli/banshee,GNOME/banshee,arfbtwn/banshee,dufoli/banshee,ixfalia/banshee,lamalex/Banshee,directhex/banshee-hacks,arfbtwn/banshee,directhex/banshee-hacks,lamalex/Banshee,lamalex/Banshee,petejohanson/banshee,GNOME/banshee,GNOME/banshee,Carbenium/banshee,babycaseny/banshee,allquixotic/banshee-gst-sharp-work,petejohanson/banshee,dufoli/banshee,dufoli/banshee,dufoli/banshee,stsundermann/banshee,babycaseny/banshee,mono-soc-2011/banshee,allquixotic/banshee-gst-sharp-work,arfbtwn/banshee,GNOME/banshee,babycaseny/banshee,dufoli/banshee,mono-soc-2011/banshee,mono-soc-2011/banshee,arfbtwn/banshee,stsundermann/banshee,stsundermann/banshee,stsundermann/banshee,directhex/banshee-hacks,ixfalia/banshee,ixfalia/banshee,allquixotic/banshee-gst-sharp-work,GNOME/banshee,GNOME/banshee,allquixotic/banshee-gst-sharp-work,Dynalon/banshee-osx,lamalex/Banshee,Dynalon/banshee-osx,ixfalia/banshee,stsundermann/banshee,Dynalon/banshee-osx,GNOME/banshee,arfbtwn/banshee,directhex/banshee-hacks,lamalex/Banshee,Carbenium/banshee,lamalex/Banshee,arfbtwn/banshee,Dynalon/banshee-osx,Carbenium/banshee,babycaseny/banshee,ixfalia/banshee,babycaseny/banshee,stsundermann/banshee,ixfalia/banshee,arfbtwn/banshee