abuild: add warning when depends_dev needs cleanup

abuild.in

@@ -1049,6 +1049,10 @@ trace_apk_deps() {
 	for i in $(sort -u "$dir"/.needs-pc 2>/dev/null); do
 		if subpkg_provides_pc "$i" || cross_compiling \
 				|| $APK info --quiet --installed "pc:$i"; then
+			local provider=$(apk search --quiet "pc:$i")
+			if list_has "$provider" $depends_dev; then
+				warning "$provider should be removed from depends_dev"
+			fi
 			autodeps="$autodeps pc:$i"
 		else
 			warning "Could not find any provider for pc:$i"