tests: Always enable gio-2.0 package
tests: Always enable gio-2.0 package

Fixes bug 622634.

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