caseql: generate better code.

* eval.c (me_case): Replace a code generation pattern of the
(if (and x y) z) with the equivalent (and x y z). The
motivation behind this is that it effectively coaxes a
jump-threading optimization out of our simplistic compiler.
The failure cases out of a single *and* all jump past the
entire code block, whereas with the cascaded if + and we get
a double test of the same failed value threading through two
branches.

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