mpcomplex: update to 1.3.1.

Fix pkglint, including renaming a patch.

Changes in version 1.3.1, released in December 2022:
  - Bug fix: It is again possible to include mpc.h without including
    stdio.h.

Changes in version 1.3.0 ("Ipomoea batatas"), released in December 2022:
  - 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.
  - Remove the unmaintained Makefile.vc; build files for Visual Studio
    can be found at https://github.com/BrianGladman/mpc .

Changes in version 1.2.1, released in October 2020:
  - Bug fixes:
    - Fix an incompatibility problem with GMP 6.0 and before.
    - Fix an intermediate overflow in asin.

Changes in version 1.2.0 ("Hyacinthus orientalis"), released in August 2020:
  - Minimally required library version: MPFR 4.1.0
  - New functions: mpc_sum, mpc_dot
  - Several functions are more robust with a reduced exponent range
    (for example corresponding to IEEE 754 binary formats)
  - New tool mpcheck.

(wiz)