compiler: use binary versions of common math functions.

* arith.c (arith_init): Register functions in the sys package:
b<, b>, b<=, b=, b+, b-, b*, b/ and neg.

* share/txr/stdlib/compiler.tl (%nary-ops%, %bin-ops%,
%bin-op%): New global variables.
(compiler comp-fun-form): Transform two-argument calls to any
of the variadic functions in %nary-ops% functions into calls
to their binary counterpart. These calls are faster, since
they bypass the wrapper which deals with the variable argument
list. Also, we detect unary - and map it to the new sys:neg
function, and reduce the one-argument cases of certain
functions to noops.

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