sys-apps/systemd: add v256.5 with musl libc patches

- https://code.atwilcox.tech/sphen/scaly/systemd
- https://catfox.life/2024/09/05/porting-systemd-to-musl-libc-powered-linux/

sys-apps/systemd/files/0017-Port-to-s6-utmps.patch

@@ -0,0 +1,72 @@
+From 09647d86120432cf9581e340b72a550df3dc2eb7 Mon Sep 17 00:00:00 2001
+From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
+Date: Sun, 18 Aug 2024 03:00:43 -0500
+Subject: [PATCH 17/34] Port to s6-utmps
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: 8bit
+
+This cannot be upstreamed.
+
+Signed-off-by: Alexander Miroshnichenko <alex@millerson.name>
+---
+ src/basic/user-util.c   | 2 +-
+ src/shared/utmp-wtmp.h  | 2 ++
+ src/sysusers/sysusers.c | 2 +-
+ src/userdb/userdbctl.c  | 2 +-
+ 4 files changed, 5 insertions(+), 3 deletions(-)
+
+diff --git a/src/basic/user-util.c b/src/basic/user-util.c
+index 6bdf5bf1cdc9..42fbabec7892 100644
+--- a/src/basic/user-util.c
++++ b/src/basic/user-util.c
+@@ -9,7 +9,7 @@
+ #include <sys/file.h>
+ #include <sys/stat.h>
+ #include <unistd.h>
+-#include <utmp.h>
++#include <utmpx.h>
+ 
+ #include "sd-messages.h"
+ 
+diff --git a/src/shared/utmp-wtmp.h b/src/shared/utmp-wtmp.h
+index 2e04fac40472..f8018ddc0141 100644
+--- a/src/shared/utmp-wtmp.h
++++ b/src/shared/utmp-wtmp.h
+@@ -8,6 +8,8 @@
+ 
+ #if ENABLE_UTMP
+ #include <utmpx.h>
++#define _PATH_UTMPX UTMPX_FILE
++#define _PATH_WTMPX WTMPX_FILE
+ 
+ int utmp_get_runlevel(int *runlevel, int *previous);
+ 
+diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
+index 7758267b17ab..3e2c91bfa323 100644
+--- a/src/sysusers/sysusers.c
++++ b/src/sysusers/sysusers.c
+@@ -1,7 +1,7 @@
+ /* SPDX-License-Identifier: LGPL-2.1-or-later */
+ 
+ #include <getopt.h>
+-#include <utmp.h>
++#include <utmpx.h>
+ 
+ #include "alloc-util.h"
+ #include "build.h"
+diff --git a/src/userdb/userdbctl.c b/src/userdb/userdbctl.c
+index 1718419407bc..1da975ed7807 100644
+--- a/src/userdb/userdbctl.c
++++ b/src/userdb/userdbctl.c
+@@ -1,7 +1,7 @@
+ /* SPDX-License-Identifier: LGPL-2.1-or-later */
+ 
+ #include <getopt.h>
+-#include <utmp.h>
++#include <utmpx.h>
+ 
+ #include "build.h"
+ #include "dirent-util.h"
+-- 
+2.41.0
+