When building gtk-doc-native the m4 functions for autoconf should use
pkg-config-native instead of pkg-config so that they can find the native
tooling.
This means that it is possible to generate gtk-doc without building the target
packages.
(From OE-Core rev: 755724d9d5f023450392ae8025a0cb6264283028)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
