libuv: Extend to nativesdk-libuv recipe

This is needed for building nativesdk-hdc in meta-openharmony [eclipse/oniro-core/meta-openharmony#65].

meta-oniro-staging/recipes-connectivity/libuv/libuv_1.44.2.bbappend

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+BBCLASSEXTEND:append = " nativesdk"