linux: add struct ifaddrs binding
linux: add struct ifaddrs binding

Fixes bug 659000.

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