codegen: Drop extra copy of captured unowned parameters in async methods
codegen: Drop extra copy of captured unowned parameters in async methods

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