glib-networking: upgrade to 2.38.0 and PACKAGECONFIGise

Use PACKAGECONFIG to add options for ca-certificates, gnutls, and libproxy.

Enable ca-certificates by default as all it needs to know is the right path,
ca-certificates not being installed isn't fatal.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
libarchive: Add -native version needed for pixz

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