posix: Mark several termios and fd_set parameters as ref
posix: Mark several termios and fd_set parameters as ref

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