Variadic function for multiplications with mpz_t

[Torbjörn Granlund]

Marc Glisse <marc.glisse at inria.fr> writes:

  mpz_srcptr actually, because it is const.
  
We actually consider mpz_ptr and mpz_srcptr as internal types, and thus
potentially mutable.

We might need to make these public, together with the corresponding mpq
and mpf types, for the sake of varargs.  Or is there another solution?

-- 
Torbjörn
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