Patch for pkg-config file

[Hugh McMaster]

Hi Niels and Marc,

On Mon, 5 Aug 2019 at 19:43, Niels Möller wrote:
> Anyway, it's not required for linking programs with the gmp library.

I've updated the changeset with the Libs.private line removed.

I've also added a changeset to generate a pkg-config file for gmpxx.

Please see the attached patches.

--
Hugh McMaster
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