macro params: use compiler-style error reporting.

* eval.c (bind_macro_params): Take the error reporting
function as a functional argument which points either to
eval_error or expand_error. Update all the recursive calls to
pass it down. Replace all calls to eval_error with this
function pointer.
(me_interp_macro, op_mac_param_bind, op_mac_env_param_bind):
Call bind_macro_params with expand_error as the function, so
that under the right circumstances, the error will go to
standard error, as well as being thrown as an exception.
In the case of me_interp_macro, this is clear. The reason we
do it for the other two is that their primary use case is
inside macros.
(op_tree_case, op_tree_bind): Pass eval_error to
mac_param_bind, preserving existing behavior.

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