glib-2.0: add explicit build dependency on DBus when ptest is enabled
If the tests are enabled then configure will check for the presence DBus. It's
generally present through the runtime dependencies so this often succeeds but as
it isn't a build dependency it's possible for DBus to be present at configure
time but removed at compile time, resulting in build failures.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
