linux: synchronize MountFlags with newer kernels
linux: synchronize MountFlags with newer kernels

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