[OpenSIPS-Devel] [OpenSIPS/opensips] e31b52: Digest auth: Fix compilation issues on CentOS 7

[Liviu Chircu]

  Branch: refs/heads/master
  Home:   https://github.com/OpenSIPS/opensips
  Commit: e31b525e08fbd013dc0c2b38b75e19b215e43efd
      https://github.com/OpenSIPS/opensips/commit/e31b525e08fbd013dc0c2b38b75e19b215e43efd
  Author: Liviu Chircu <liviu at opensips.org>
  Date:   2021-04-14 (Wed, 14 Apr 2021)

  Changed paths:
    M lib/digest_auth/dauth_hexops.h
    M lib/digest_auth/dauth_nonce.c

  Log Message:
  -----------
  Digest auth: Fix compilation issues on CentOS 7

* rename "static_assert" to "_Static_assert" (better compatibility)
* avoid variable declarations inside for loops
* avoid _BSD_SOURCE re-definition