Convert to new override syntax

This is the result of automated script conversion:

scripts/contrib/convert-overrides.py <oe-core directory>

converting the metadata to use ":" as the override character instead of "_".

(From OE-Core rev: 42344347be29f0997cc2f7636d9603b1fe1875ae)

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

meta/classes/multilib_header.bbclass

@@ -42,11 +42,11 @@ oe_multilib_header() {
 
 # 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 () {
+oe_multilib_header:class-native () {
 	return
 }
 
 # Nor do we need multilib headers for nativesdk builds.
-oe_multilib_header_class-nativesdk () {
+oe_multilib_header:class-nativesdk () {
 	return
 }