Fix regression in broken mlock detection.
* acinclude.m4 (GNUPG_CHECK_MLOCK): Fix typo EGAIN->EAGAIN.
- GnuPG-bug-id: T2870
- Fixes-commit: 618b8978f46f4011c11512fd5f30c15e01652e2e
- Co-authored-by: Nicolas Porcel <nicolasporcel06@gmail.com>
- Signed-off-by: Werner Koch <wk@gnupg.org>