Macro x11_link

macro_rules! x11_link {
    { $struct_name:ident, $pkg_name:ident, [$($lib_name:expr),*], $nsyms:expr,
    $(pub fn $fn_name:ident ($($param_name:ident : $param_type:ty),*) -> $ret_type:ty,)*
    variadic:
    $(pub fn $vfn_name:ident ($($vparam_name: ident : $vparam_type:ty),+) -> $vret_type:ty,)*
    globals:
    $(pub static $var_name:ident : $var_type:ty,)*
  } => { ... };
}