The gtk-doc class already calls gtkdocize, so we don't need to do it again
(From OE-Core rev: 14c6e4fd793e037d801a81c6581e0642ef61ab0c)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>