lib: address remaining unused variable warnings.

* stdlib/arith-each.tl (sys-arith-each): Remove :form param.

* stdlib/awk.tl (awk-state :fini): Suppress unused warning
in dohash form by using an uninterned symbol for this
variable. This is a useful technique worth documenting.
(awk-expander): Remove unused varaible in a predicate
pattern.
(awk-code-move-check): Lose the unused awc and aws-sym.
(awk-mac-let): Don't pass the unused parameters to
awk-code-move-check.

* stdlib/conv.tl (conv-expand): Remove unused gensym.

* stdlib/debugger.tl (fcall-frame loc,
fcall-frame print-trace, expand-frame print-trace):
Mark unused parameters ignored.

* stdlib/defset.tl (defset-expander-simple): Remove
unused parameter.
(defset): Drop argument from defset-expander-simple
call, and also fix unused warning in tree-case form.

* stdlib/doc-lookup.tl (detached-run): Remove unused
variable from a pattern matching predicate.
It's not in the rightmost position so we have to
revers the comparison. I will enhance the pattern
matcher to support @nil in a predicate.
(toplevel): Ignore a parameter of the not-implemented
version of the open-url function.

* stdlib/doloop.tl (expand-dooloop): Replace unused
variable in a tree binding pattern with the t
symbol.

* stdlib/each-prod.tl (expand-each-prod*): Remove
unused let variable.

* stdlib/except.tl (expand-handle): Put else variable
in tree bind pattern to use.

* stdlib/getopts.tl (opt-desc (basic-type-p, cumul-type-p)):
Replace unused catch-all variable in tree bind pattern
with t symbol.
(opt-processor parse-opts): Remove unused args argument.
The object holds the args, prepared at construction time.
(getopts, option-base getopts): Don't pass args to parse-opts.
(define-option-struct): Replace unused treee pattern
variable with t.

* stdlib/ifa.tl (if-to-cond): Put catch-all else variable
to use.

* stdlib/keyparams.tl (param-expander): Mark unused parameter
ignored. Replace unused variables in tree-case with t.

* stdlib/match.tl (compile-struct-match, compile-predicate-match,
compile-require-match, compile-as-match, compile-with-match,
compile-or-match, compile-and-match, compile-not-match,
compile-hash-match, compile-scan-match, compile-exprs-match):
Address unused variables in mac-param-bind and tree-bind
patterns.
(match-case): Likewise, and also remove unused let variables.
(while-match-case, while-true-match-case): Remove unused
:env parameter.
(expand-lambda-match): Remove unused let variable.
(defun-match): Remove unused variable in tree-bind.
(define-param-expander): Mark menv parameter ignored.
Unused variables in tree-bind.
(defmatch): Replace lambda variable with a gensym.
(loosen, pat-len): Remove unused parameter.
(sme, end): Fix calls to loosen and pat-len.
(non-triv-pat-p): Mark parameter ignored in the
temporary version of this function.
(expand-quasi-match): Address unused variables in patterns,
and remove unused gensyms.

* stdlib/op.tl (op-rec-p): Unused variable in tree-case.
(op-alpha-rename): Remove f parameter.
(op-ignerr): Mark catch handler parameter ignored.
(op-expand): Remove argument from calls to op-alpha-rename.

* stdlib/path.test (if-windows, if-native-windows): The
compiler complains here about the unused variable
due to constant folding. We use the use function
to indicate that the variable is not ignored, but used.

* stdlib/pic.tl (expand-pic-num): Remove unused let variable.
(pic): Remove unused :env parameter.

* stdlib/place.tl (macroexpand-1-place): Ignore unused
env parameter.
(pset): Ignore some tree-bind variables. Not replacing
them with t because their names help code readability.
Lots of tricky code in place.tl.
(shift): Replace unused variable with t in tree-case.
(vecref, chr-str, ref, sub): Deal with unused expander
parameters.
(gethash): Deal with unused place parameter.
(dwim): Remove unused env parameter, and deal with
unused place parameters.
(get-fun-getter-setter): Unused variables in tree-bind.
(read-once, define-modify-macro): Remove unused gensyms.
(placelet-1): Mark ignored a parameter of an update
expander lambda.

* stdlib/pmac.tl (macroexpand-params): Fix unused
catch-all in tree-case.

* stdlib/struct.tl (prune-missing-inits): Mark
tree-bind unused variable ignored.
(defstruct): Unused tree-case variable.
(qref): Unused tree-case catch-all variables.
(rslot): Unused parameter removed.
(:delegate): Unused tree-case variables.

* stdlib/tagbody.tl (tagbody): Drop unused :env param.
Mark ignored the threaded-2 let variable, which cannot
be removed because its init-form performs a needed
side effect.

* stdlib/trace.tl (trace-leave): Remove unused param.
(trace): Don't pass argument to unused param of trace-leave.
(untrace): Use gensym in dohash to suppress unused
variable warning.

* stdlib/type.tl (typecase-expander): Unused variable
in tree-case.

* stdlib/with-resources.tl (with-resources): Likewise.

* stdlib/yield.tl (hlet-expand): Remove two unused locals.

* tests/012/lambda.tl: Fix test cases that break the
tests due to unused variable warnings.

* tests/016/arith.tl: Add test case for each-prod*.
At first I thought a bug was found in it but it turned
out that the init-forms variable that was removed
was really superfluous.

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