compiler: bug: scoping of lambda optionals.

The scoping is not behind handled correctly for optional
variables. The init-forms are being evaluated in a scope
in which all the variables are already visible, instead
of sequentially. Thus, for instance, variable rebinding
doesn't work, as in (lambda (: (x x)) ...). When the
argument is missing, x ends up with the value : because
the expression refers to the new x, rather than the
outer x.

* stdlib/compiler.tl (compiler comp-lambda-impl):
Perform the compilation of the init-forms earlier.
Use the same new trick that is used for let*:
the target for the code fragment is a locaton obtained
from get-loc, which is then attached to a variable
afterward. The spec-sub helper is extended with a loc
parameter to help with this case.

* tests/012/lambda.tl: New test case that fails without
this fix.

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