package/systemd: use util-linux' agetty, drop patch

We currently have a patch that replaces the use of (hard-coded) agetty
in systemd, to use just plain getty. That patch dates back to commit
f4a5eed474c (Add the systemd package), when util-linux was not a
dependency, and we relied on busybox to actually provide getty.

But nowadays, util-linux is a mandatory dependency of systemd anyway.
agetty is about 42KiB, while busybox' getty is around 5KiB (give or
take). That's an extra ~40KiB, but it has to be balanced against the
rest of the system: systemd only runs on a glibc system, needs dbus and
thus expat, and kmod, that a ~40KiB overhead is barely noticeable (a
miminal systemd setup with nothing enabled, on ARM, is already ~20MiB)

So, drop our agetty-dropping patch, and forcibly enable agetty in
util-linux.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Adam Duskett <aduskett@gmail.com>
Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/systemd/0001-fix-getty-unit.patch

@@ -1,81 +0,0 @@
-From 69e440f9b7a0e9a43ef582d4bb521722b448a7c2 Mon Sep 17 00:00:00 2001
-From: Maxime Ripard <maxime.ripard@free-electrons.com>
-Date: Mon, 31 Jul 2017 10:08:46 -0400
-Subject: [PATCH] fix-getty-unit
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Prefer getty to agetty in console setup systemd units
-
-Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
-Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
-[aduskett@gmail.com: Update for systemd v237]
-Signed-off-by: Adam Duskett <aduskett@gmail.com>
-[Jérémy: replace additional usage of agetty by getty.]
-Signed-off-by: Jérémy Rosen <jeremy.rosen@smile.fr>
----
- units/console-getty.service.m4    | 2 +-
- units/container-getty@.service.m4 | 2 +-
- units/getty@.service.m4           | 5 +----
- units/serial-getty@.service.m4    | 2 +-
- 4 files changed, 4 insertions(+), 7 deletions(-)
-
-diff --git a/units/console-getty.service.m4 b/units/console-getty.service.m4
-index 3c553240a..fd5ad9456 100644
---- a/units/console-getty.service.m4
-+++ b/units/console-getty.service.m4
-@@ -23,7 +23,7 @@ ConditionPathExists=/dev/console
- # The '-o' option value tells agetty to replace 'login' arguments with an
- # option to preserve environment (-p), followed by '--' for safety, and then
- # the entered username.
--ExecStart=-/sbin/agetty -o '-p -- \\u' --noclear --keep-baud console 115200,38400,9600 $TERM
-+ExecStart=-/sbin/getty -L console 115200 vt100
- Type=idle
- Restart=always
- UtmpIdentifier=cons
-diff --git a/units/container-getty@.service.m4 b/units/container-getty@.service.m4
-index 087ab7f9b..30f7b66fe 100644
---- a/units/container-getty@.service.m4
-+++ b/units/container-getty@.service.m4
-@@ -28,7 +28,7 @@ Before=rescue.service
- # The '-o' option value tells agetty to replace 'login' arguments with an
- # option to preserve environment (-p), followed by '--' for safety, and then
- # the entered username.
--ExecStart=-/sbin/agetty -o '-p -- \\u' --noclear --keep-baud pts/%I 115200,38400,9600 $TERM
-+ExecStart=-/sbin/getty -L %I 115200 vt100
- Type=idle
- Restart=always
- RestartSec=0
-diff --git a/units/getty@.service.m4 b/units/getty@.service.m4
-index 80e793bb7..385758c61 100644
---- a/units/getty@.service.m4
-+++ b/units/getty@.service.m4
-@@ -35,10 +35,7 @@ ConditionPathExists=/dev/tty0
- 
- [Service]
- # the VT is cleared by TTYVTDisallocate
--# The '-o' option value tells agetty to replace 'login' arguments with an
--# option to preserve environment (-p), followed by '--' for safety, and then
--# the entered username.
--ExecStart=-/sbin/agetty -o '-p -- \\u' --noclear %I $TERM
-+ExecStart=-/sbin/getty -L %I 115200 vt100
- Type=idle
- Restart=always
- RestartSec=0
-diff --git a/units/serial-getty@.service.m4 b/units/serial-getty@.service.m4
-index 757b86ab2..3d60efdb6 100644
---- a/units/serial-getty@.service.m4
-+++ b/units/serial-getty@.service.m4
-@@ -33,7 +33,7 @@ Before=rescue.service
- # The '-o' option value tells agetty to replace 'login' arguments with an
- # option to preserve environment (-p), followed by '--' for safety, and then
- # the entered username.
--ExecStart=-/sbin/agetty -o '-p -- \\u' --keep-baud 115200,38400,9600 %I $TERM
-+ExecStart=-/sbin/getty -L %I 115200 vt100
- Type=idle
- Restart=always
- UtmpIdentifier=%I
--- 
-2.14.4
-

package/systemd/Config.in

@@ -20,6 +20,7 @@ menuconfig BR2_PACKAGE_SYSTEMD
 	select BR2_PACKAGE_UTIL_LINUX_LIBBLKID
 	select BR2_PACKAGE_UTIL_LINUX_LIBMOUNT
 	select BR2_PACKAGE_UTIL_LINUX_BINARIES
+	select BR2_PACKAGE_UTIL_LINUX_AGETTY
 	select BR2_PACKAGE_UTIL_LINUX_MOUNT
 	select BR2_PACKAGE_UTIL_LINUX_NOLOGIN
 	select BR2_PACKAGE_UTIL_LINUX_FSCK