patch applied (ghc): mpz_foo() functions are really called __gmpz_foo() in GMP

[Simon Marlow]

Thu Jun 29 05:22:17 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * mpz_foo() functions are really called __gmpz_foo() in GMP
  gmp.h #defines mpz_foo to __gmpz_foo, so the real ABI is __gmpz_foo,
  so that is what we must invoke in order to be portable here.
  Similarly for mpn --> __gmpn.

    M ./rts/PrimOps.cmm -22 +22