compiler: fix: careless constant folding of call.

* share/txr/stdlib/compiler.tl (compiler comp-apply-call): The
conditions for constant-folding a call expressions are too
weak. The first argument could be a quoted symbol, which is a
constant expression, and so we end up wrongly evaluating
an expression like (call 'print '3) at compile time.
We can constant-fold if the first expression evaluates to a
symbol, which names a constant-foldable function, or else
if it evaluates to something which is not a bindable symbol.

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