add g_variant_unref to bindings
add g_variant_unref to bindings

note that if you call g_variant_unref() directly as a function then some
versions of GCC have a bug that will cause invalid code to be emitted.
this declaration is really only meant to be used as a callback.

spidermonkdust/vala,tjol/vala-tjol,xdave/pvala,phako/vala,GNOME/vala,playya/vala,severinh/vala,phako/vala,frida/vala,rvu95/vala,rvu95/vala,frida/vala,GNOME/vala,kamanashisroy/aroop,frida/vala,Distrotech/vala,spidermonkdust/vala,spidermonkdust/vala,Jc2k/vala,flobrosch/vala-fixes,jessevdk/vala,Distrotech/vala,frida/vala,jessevdk/vala,kamanashisroy/aroop,Jc2k/vala,playya/vala,flobrosch/vala-fixes,flobrosch/vala-fixes,tjol/vala-tjol,Distrotech/vala,severinh/vala,playya/vala,lovebug356/vala,jessevdk/vala,tjol/vala-tjol,GNOME/vala,themiwi/vala,themiwi/vala,rvu95/vala,frida/vala,themiwi/vala,severinh/vala,kamanashisroy/aroop,lovebug356/vala,GNOME/vala