cross/crosssdl/native/nativesdk: Fix do_packagedata stamps

If you build nativesdk for machine A, then change to B you will see sstate
manifest warnings for the packagedata files. The stamps are machine
specific and should not be, ditto for native.

This patch copies the populate-sysroot extra stamp entries to avoid
these warnings.

(From OE-Core rev: a64de25d6006ec6dd777d8f3820a48244dfbf62b)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/cross.bbclass

@@ -56,6 +56,7 @@ libexecdir = "${exec_prefix}/libexec/${CROSS_TARGET_SYS_DIR}"
 
 do_populate_sysroot[sstate-inputdirs] = "${SYSROOT_DESTDIR}/${STAGING_DIR_NATIVE}/"
 do_populate_sysroot[stamp-extra-info] = ""
+do_packagedata[stamp-extra-info] = ""
 
 python cross_virtclass_handler () {
     classextend = e.data.getVar('BBCLASSEXTEND', True) or ""