compiler: compiler options mechanism.

Introducing a compiler options system, so we can
control diagnostics and such. We begin with
three options for diagnosing shadowing.

* autoload.c (compiler_set_entries): Register a
structure name compiler-opts, a with-compile-opts
function name, *compile-opts* variable name, and
slots shadow-fun, shadow-var and shadow-cross.

* stdlib/compiler.tl (compile-opts): New struct.
(%warning-syms%): New macro.
(*compile-opts*): New special variable.
(when-opt, with-compile-opts): New macros.
(opt-controlled-diag): New function.
(env extend-var): Call extend-var* method instead of
repeating code.
(env extend-var*): Implement shadow-var and shadow-cross
diagnostic options.
(env extend-fun): Implement shadow-fun and shadow-cross
diagnostic options.

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