package/open-lldp: fix musl build with >= gcc-14.x

GCC >= 14.x is stricter amount having access to the prototypes of
functions being used, causing a build failure in open-lldp due to a
missing <string.h> include. This is only visible with musl probably
because with other C libraries <string.h> end up being included by
some other header.

Fixes:
https://autobuild.buildroot.net/results/0f8/0f88cbe9152ab816b4ae17e1d84e8257f458eb4a/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit fe917c36719de4916bfa4be0397d8c838b0d021d)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/open-lldp/0001-clif-Include-string.h-for-mem-function-prototypes.patch

@@ -0,0 +1,26 @@
+From f9d0099ac7d9041447cce4d3edd9577b4b52c09c Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Mon, 29 Aug 2022 22:37:14 -0700
+Subject: [PATCH] clif: Include string.h for mem* function prototypes
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+Upstream: https://github.com/intel/openlldp/commit/f9d0099ac7d9041447cce4d3edd9577b4b52c09c
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ clif.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/clif.c b/clif.c
+index cad6f75..0758a7e 100644
+--- a/clif.c
++++ b/clif.c
+@@ -32,6 +32,7 @@
+ 
+ #include <stdlib.h>
+ #include <stdio.h>
++#include <string.h>
+ #include <unistd.h>
+ #include <sys/types.h>
+ #include <sys/socket.h>