Fixed NIS build requirements

Resolves: rhbz#1942369

postfix.spec

@@ -49,7 +49,7 @@
 Name: postfix
 Summary: Postfix Mail Transport Agent
 Version: 3.5.9
-Release: 7%{?dist}
+Release: 8%{?dist}
 Epoch: 2
 URL: http://www.postfix.org
 License: (IBM and GPLv2+) or (EPL-2.0 and GPLv2+)
@@ -102,10 +102,9 @@ Patch11: postfix-3.4.4-chroot-example-fix.patch
 # Determine the different packages required for building postfix
 BuildRequires: make
 BuildRequires: libdb-devel, perl-generators, pkgconfig, zlib-devel
-BuildRequires: systemd-units, libicu-devel, libnsl2-devel
+BuildRequires: systemd-units, libicu-devel
 BuildRequires: gcc, m4, findutils
-%if 0%{?rhel} >= 9
-%else
+%if 0%{?rhel} < 9
 BuildRequires: libnsl2-devel
 %endif
 
@@ -786,6 +785,10 @@ fi
 %endif
 
 %changelog
+* Thu Apr 22 2021 Jaroslav Škarvada <jskarvad@redhat.com> - 2:3.5.9-8
+- Fixed NIS build requirements
+  Resolves: rhbz#1942369
+
 * Fri Apr 16 2021 Mohan Boddu <mboddu@redhat.com> - 2:3.5.9-7
 - Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937