- Add mpc-1.3.0-gmpdep.patch to avoid dependence on stdio.h when
including mpc.h

- Update to version 1.3.0.
* New function: mpc_agm
* New rounding modes "away from zero", indicated by the letter "A"
and corresponding to MPFR_RNDA on the designated real or imaginary part.
* New experimental ball arithmetic.
* New experimental function: mpc_eta_fund
* Bug fixes:
- mpc_asin for asin(z) with small |Re(z)| and tiny |Im(z)|
- mpc_pow_fr: sign of zero part of result when the base has up to sign
the same real and imaginary part, and the exponent is an even
positive integer
- mpc_fma: the returned int value was incorrect in some cases
(indicating whether the rounded real/imaginary parts were
smaller/equal/greater than the exact values), but the computed
complex value was correct.