libarchive: Add support_format_raw method to Read class
libarchive: Add support_format_raw method to Read class

Fixes bug 655372.

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