girparser: Support specifying symbols in metadata
girparser: Support specifying symbols in metadata

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