glib-2.0: add g_strsignal binding
glib-2.0: add g_strsignal binding

Fixes bug 628934.

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