[gssapi/gssproxy] f01c74: Fix warnings in configure programs

[Robbie Harwood]

Branch: refs/heads/main
  Home:   https://github.com/gssapi/gssproxy
  Commit: f01c74930ad83802a1fde020554da4dcf901c005
      https://github.com/gssapi/gssproxy/commit/f01c74930ad83802a1fde020554da4dcf9...
  Author: Robbie Harwood 
  Date:   2020-11-09 (Mon, 09 Nov 2020)

Changed paths:
    M configure.ac

Log Message:
  -----------
  Fix warnings in configure programs

Signed-off-by: Robbie Harwood

Commit: 237bfd02f0e485201277b6f513bb05820676224d
      https://github.com/gssapi/gssproxy/commit/237bfd02f0e485201277b6f513bb058206...
  Author: Robbie Harwood 
  Date:   2020-11-09 (Mon, 09 Nov 2020)

Changed paths:
    M external/ax_pthread.m4

Log Message:
  -----------
  Update vendored ax_pthread.m4

This helps with compiler warnings for -Wall.

Signed-off-by: Robbie Harwood

Commit: 68c4a7f37dfa94c51bc0f5385f774c8008d319cd
      https://github.com/gssapi/gssproxy/commit/68c4a7f37dfa94c51bc0f5385f774c8008...
  Author: Robbie Harwood 
  Date:   2020-11-09 (Mon, 09 Nov 2020)

Changed paths:
    M .github/workflows/ci.yaml

Log Message:
  -----------
  Switch to calling distcheck in CI

This should prevent problems like
e2240d1b8f1d68fdfbf0881ad892d9b1956e4512 where we accidentally miss
files in the tarball.

Signed-off-by: Robbie Harwood

Compare: https://github.com/gssapi/gssproxy/compare/e2240d1b8f1d...68c4a7f37dfa