glapi/gen needs the libxml2 Python module, but this isn't listed as a build
dependency.
(From OE-Core rev: 12414a65bfa9222be0fe0ab7ced2a02e1e5ed2ed)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>