Turn *gensym-counter* into proper special variable.

* eval.c (eval_init): Save *gensym-counter* symbol in gensym_counter_s
symbol variable right after interning, and use zero as the inital value
rather than the gensym_counter variable which is removed now.

* lib.c (gensym_counter_s): New symbol variable.
(gensym_counter): Variable removed.
(gensym): Slight refactoring to avoid a double variable lookup.
Also, for generational GC correctness, use the set macro to update it,
since the variable could live inside heap object and the counter
could overflow to bignums which are heap objects.
(obj_init): Remove initialization of gensym_counter.

* lib.h (gensym_counter_s): Declared.
(gensym_counter): Declaration removed, replaced by macro.

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