posix: add lseek binding
posix: add lseek binding

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