abuild: bugfix in dep tracing

due to unintialized and non-local variable the tracing of deps
didnt work as expected when dependencies was provided by the apkbuild
itself. (libgcc ended up depending on libgcj which depended on binutils)

abuild.in

@@ -624,7 +624,7 @@ find_so_files() {
 trace_apk_deps() {
 	local name="$1"
 	local dir="$2"
-	local i= j= found= autodeps= deppkgs= missing= so_paths=
+	local i= j= found= autodeps= deppkgs= missing= so_paths= self_provided=
 	msg "Tracing dependencies for $name..."
 	# add pkgconfig if usr/lib/pkgconfig is found
 	if [ -d "$pkgbasedir"/$name/usr/lib/pkgconfig ] \