opensmtpd: add pam.d file.

srcpkgs/opensmtpd/files/smtpd.pam

@@ -0,0 +1,5 @@
+#%PAM-1.0
+auth       required     pam_nologin.so
+auth       include      system-auth
+account    include      system-auth
+session    include      system-auth

srcpkgs/opensmtpd/template

@@ -1,7 +1,7 @@
 # Template file for 'opensmtpd'
 pkgname=opensmtpd
 version=6.8.0p2
-revision=3
+revision=4
 build_style=gnu-configure
 configure_args="--sysconfdir=/etc/smtpd --sbindir=/usr/bin
  --with-path-socket=/run --with-path-pidfile=/run
@@ -49,6 +49,7 @@ post_install() {
 	for f in newaliases mailq makemap sendmail; do
 		ln -s smtpctl ${DESTDIR}/usr/bin/$f
 	done
+	vinstall ${FILESDIR}/smtpd.pam 644 etc/pam.d smtpd
 	vsv opensmtpd
 	vlicense LICENSE
 	vinstall /dev/null 644 etc/smtpd aliases