librsvg-2.0: remove from gir-bindings target
librsvg-2.0: remove from gir-bindings target

The librsvg bindings distributed with Vala have been deprecated in
favor of those distributed with librsvg for some time now.  By
removing them from the gir-bindings target we can avoid API changes
and keep CI working while still updating the GIR for valadoc.org.

frida/vala,spidermonkdust/vala,rvu95/vala,flobrosch/vala-fixes,GNOME/vala,GNOME/vala,spidermonkdust/vala,frida/vala,flobrosch/vala-fixes,frida/vala,GNOME/vala,spidermonkdust/vala,frida/vala,flobrosch/vala-fixes,frida/vala,rvu95/vala,rvu95/vala,GNOME/vala