[PATCH] mulitilib_header: Avoid sstate checksum issues for -native recipes

[Richard Purdie <richard.purdie@linuxfoundation.org>]

The use of arch specific variables like MIPSPKGSFX_ABI was creeping
into the -native sstate checksums of package like ncurses-native.

This is pointless and undesireable. We could add specific variable
exclusions but we might as well just brute force the code to be disabled
in the -native case since we don't use multilibs in the native case.

[YOCTO #3827]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/meta/classes/multilib_header.bbclass b/meta/classes/multilib_header.bbclass
index 639ed4b..4d049a8 100644
--- a/meta/classes/multilib_header.bbclass
+++ b/meta/classes/multilib_header.bbclass
@@ -39,3 +39,9 @@ oe_multilib_header() {
 	   sed -e "s#ENTER_HEADER_FILENAME_HERE#${stem}#g" ${COREBASE}/scripts/multilib_header_wrapper.h > ${D}/${includedir}/$each_header
 	done
 }
+
+# Dependencies on arch variables like MIPSPKGSFX_ABI can be problematic.
+# We don't need multilib headers for native builds so brute force things.
+oe_multilib_header_class-native () {
+	return
+}