This is necessary to get things building again after libselinux changes.

A proper fix is under discussion upstream:

  <https://sourceware.org/pipermail/libc-alpha/2020-July/116504.html>

diff --git a/nss/makedb.c b/nss/makedb.c

index 8e389a1683747cf1..9d81aed57d384a22 100644

--- a/nss/makedb.c

+++ b/nss/makedb.c

@@ -17,6 +17,10 @@

    License along with the GNU C Library; if not, see

    <https://www.gnu.org/licenses/>.  */

+/* This file uses deprecated declarations from libselinux.  */

+#include <libc-diag.h>

+DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");

+

 #include <argp.h>

 #include <assert.h>

 #include <ctype.h>