Corrected prototypes for mpq_set/cmp_ui/si.
Corrected prototypes for mpq_set/cmp_ui/si.

wbhart/flint2,fredrik-johansson/flint2,wbhart/flint2,fredrik-johansson/flint2,jpflori/flint2,dsroche/flint2,fredrik-johansson/flint2,jpflori/flint2,jpflori/flint2,dsroche/flint2,dsroche/flint2,wbhart/flint2,jpflori/flint2,dsroche/flint2