package/openssh: fix musl compile issue

Building package/openssh 9.9p1 with musl failed during linking because
construct_utmp() was referenced due to "use construct_utmp to
construct btmp records" [1], but not built as utmp is disabled in the
Buildroot package. The fix comes from upstream and ensures the
construct_utmp function actually gets built when USE_BTMP is set [2].

[1] https://anongit.mindrot.org/openssh.git/commit/?id=671c440786a5a66216922f15d0007b60f1e6733f
[2] https://anongit.mindrot.org/openssh.git/commit/?id=76a618d2842c34c16cd21a4efc7230e2f459008d

Fixes:

  http://autobuild.buildroot.net/results/1e651724373f32e45d122d05fa3a10ac88fe29dc/

Signed-off-by: Fiona Klute (WIWA) <fiona.klute@gmx.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 2065fecbf30b0b91263fa7f30e5b1786055b968a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/openssh/0001-build-construct_utmp-when-USE_BTMP-is-set.patch

@@ -0,0 +1,35 @@
+From 76a618d2842c34c16cd21a4efc7230e2f459008d Mon Sep 17 00:00:00 2001
+From: Damien Miller <djm@mindrot.org>
+Date: Wed, 25 Sep 2024 11:13:05 +1000
+Subject: [PATCH] build construct_utmp() when USE_BTMP is set
+
+Fixes compile error on Void Linux/Musl
+
+Upstream: https://anongit.mindrot.org/openssh.git/commit/?id=76a618d2842c34c16cd21a4efc7230e2f459008d
+Signed-off-by: Fiona Klute (WIWA) <fiona.klute@gmx.de>
+---
+ loginrec.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/loginrec.c b/loginrec.c
+index 45f13dee8b1f..7b1818b86753 100644
+--- a/loginrec.c
++++ b/loginrec.c
+@@ -614,7 +614,7 @@ line_abbrevname(char *dst, const char *src, int dstsize)
+  ** into account.
+  **/
+
+-#if defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
++#if defined(USE_BTMP) || defined(USE_UTMP) || defined (USE_WTMP) || defined (USE_LOGIN)
+
+ /* build the utmp structure */
+ void
+@@ -698,7 +698,7 @@ construct_utmp(struct logininfo *li,
+ 	}
+ # endif
+ }
+-#endif /* USE_UTMP || USE_WTMP || USE_LOGIN */
++#endif /* USE_BTMP || USE_UTMP || USE_WTMP || USE_LOGIN */
+
+ /**
+  ** utmpx utility functions