bzlib: add BZFILE binding
bzlib: add BZFILE binding

Fixes bug 656710.

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