[SSSD] [sssd PR#370][opened] certmap: Suppress warning Wmissing-braces

[lslebodn]

   URL: https://github.com/SSSD/sssd/pull/370
Author: lslebodn
 Title: #370: certmap: Suppress warning Wmissing-braces
Action: opened

PR body:
"""
Older version of gcc(e.g. gcc-4.8.5-11.el7) had a false positive warning
with c99 struct initialisation "{ 0 }".
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64709

  CC       src/lib/certmap/libsss_certmap_la-sss_cert_content_nss.lo

src/lib/certmap/sss_cert_content_nss.c:
    In function 'add_pkinit_princ_to_san_list':
src/lib/certmap/sss_cert_content_nss.c:475:12:
    error: missing braces around initializer [-Werror=missing-braces]
     struct kerberos_principal_name kname = { 0 };
            ^
src/lib/certmap/sss_cert_content_nss.c:475:12:
    error: (near initialization for 'kname.realm') [-Werror=missing-braces]
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/370/head:pr370
git checkout pr370