mpi/generic: use longlong.h for carry handling
* mpi/generic/mpih-add1.c (_gcry_mpih_add_n): Use add_ssaaaa for carry handling. * mpi/generic/mpih-mul1.c (_gcry_mpih_mul_1): Likewise. * mpi/generic/mpih-mul2.c (_gcry_mpih_addmul_1): Likewise. * mpi/generic/mpih-mul3.c (_gcry_mpih_submul_1): Use add_ssaaaa and sub_ddmmss for carry handling. * mpi/generic/mpih-sub1.c (_gcry_mpih_sub_n): Likewise.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>