fix(mpz_realloc): fix minor bugs in proof of mpz_realloc.

projects/mini-gmp.h

@@ -1,6 +1,7 @@
 /*@ 
   Extern Coq (Zabs : Z -> Z) 
-             (Zmax : Z -> Z -> Z)
+             (Z::max : Z -> Z -> Z)
+             (Z::pow : Z -> Z -> Z)
              (mpd_store_Z : Z -> Z -> Z -> Z -> Assertion)
              (mpd_store_Z_compact: Z -> Z -> Z -> Z -> Assertion)
              (mpd_store_list : Z -> list Z -> Z -> Assertion)
@@ -8,6 +9,7 @@
              (list_store_Z : list Z -> Z -> Prop)
              (list_store_Z_compact: list Z -> Z -> Prop)
              (last: list Z -> Z -> Z)
+             (UINT_MOD: Z)
 */
 
 typedef struct __mpz_struct