libnewt: Add nativesdk

Add nativesdk for libnewt.

(From OE-Core rev: 6414d23cd23fc6ed2d31a7b55fce1be82a09ae67)

Signed-off-by: Zheng Ruoqin <zhengrq.fnst@cn.fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/newt/libnewt_0.52.20.bb

@@ -51,4 +51,4 @@ do_compile_prepend() {
 
 FILES_whiptail = "${bindir}/whiptail"
 
-BBCLASSEXTEND = "native"
+BBCLASSEXTEND = "native nativesdk"