with-compile-options: reimplement using compiler-let

The with-compile-opts macro is rewritten such that
it cad occur inside code that is being compiled, and
change compiler options for individual subexpressions.

It continues to work as before in scripted build steps
such as when calls to (compile-file ...) are wrapped
in it. However, for the time being, that now only works
in interpreted code, because with this change, when
a with-compile-opts form is compiled, it no longer
arranges for the binding of *compile-opts* to be visible
to the subforms; the binding affects the compiler's
own environment.

* stdlib/compiler.tl (with-compile-opts): Rewrite.

* txr.1: Documented.

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