Rename vala.vapi to libvala.vapi to match pkg-config name
Rename vala.vapi to libvala.vapi to match pkg-config name

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