glib-2.0: Add GSource methods introduced in glib 2.36
glib-2.0: Add GSource methods introduced in glib 2.36

frida/vala,Distrotech/vala,frida/vala,rvu95/vala,flobrosch/vala-fixes,spidermonkdust/vala,rvu95/vala,xdave/pvala,rvu95/vala,spidermonkdust/vala,Distrotech/vala,GNOME/vala,spidermonkdust/vala,Distrotech/vala,frida/vala,GNOME/vala,frida/vala,flobrosch/vala-fixes,GNOME/vala,frida/vala,flobrosch/vala-fixes,GNOME/vala