Deal with situation when GC is disabled and the freshobj array runs out

of room.  This could happen when parsing a really large TXR program,
since gc is disabled during parsing. Currently it asserts, which
is not acceptable.

* gc.c (make_obj): If after gc, the freshobj array has not been
emptied (obviously because gc is disabled), do not assert.
Rather, set the full_gc flag to request a full garbage collection
when gc is re-enabled.  Furthermore, only place newly allocated objects
into freshobj if full_gc has not been set. Thus, if we exhaust the
freshobj array while gc is off, the full_gc flag is set, and we
discontinue use of that array. When gc is re-enabled, we will do a full
gc pass. A full gc pass ignores freshobj array, so it doesn't matter
that its use was discontinued.

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