[PATCH] Fix build with libassuan 2.

[Niibe Yutaka]

Hello,

Collin Funk <collin.funk1 at gmail.com> wrote:
> * src/assuan-support.c: Include util.h for the assuan_pid_t definition.

Thank you for the patch to GPGME.  Applied and pushed (tested with
libassuan 2).
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