Clean-up rand code; implement configurable warmup.

* lib.c (copy): Pass new second argument to make_random_state.

* rand.c (random_warmup): New macro.
(random_warmup_s): New symbol variable.
(make_random_state): New warmup argument. Code restructured to
avoid copy flag. Fill code and initialization of r->cur made
common.
(rand_compat_fixup): Pass second argument to
make_random_state.
(rand_init): Pass second argument to make_random_state.
Initialize random_warmup_s with interned symbol. Register
*random-warmup* special variable. Fix registration of
make-random-state to two-argument function type.

* rand.h (make_random_state): Declaration updated.

* txr.1: Document *random-warmup* variable and warup
argument of make-random-state.

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