abuild: add version number to provides

So it is not treated as a special 'virtual'
We use version number 0 for now.

abuild.in

@@ -921,7 +921,7 @@ trace_apk_deps() {
 
 	echo "# automatically detected:" >> "$dir"/.PKGINFO
 	if [ -f "$dir"/.provides-so ]; then
-		sed 's/^/provides = /' "$dir"/.provides-so >> "$dir"/.PKGINFO
+		sed 's/^\(.*\)/provides = \1=0/' "$dir"/.provides-so >> "$dir"/.PKGINFO
 	fi
 	[ -z "$autodeps" ] && return 0
 	for i in $autodeps; do