### Calc: add missing dynamic variable declarations

* lisp/calc/calc-alg.el (math-simplify-only, calc-simplify-mode) (math-expand-formulas, calc-poly-div-remainder) (math-living-dangerously, math-simplifying, calc-angle-mode) (calc-prefer-frac, math-poly-base-variable): Declare dynamic variables. * test/lisp/calc/calc-tests.el (calc-poly-div): Add test for at least one bug caused by missing declarations.

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