bind: Fix syntax overrides

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-core/recipes-connectivity/bind/bind_%.bbappend

@@ -2,5 +2,5 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 SRC_URI += "file://bind-9.11.32-libunwind-header.patch"