package/strongswan: fix build w/ wolfssl 5.9.2

The 'mlkem.h' header is no longer present in wolfssl v5.9.2 [1] and the
content was merged in the 'wc_mlkem.h' header.

[1] 7a2cf5b655

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/strongswan/0001-wolfssl-Adapt-to-removed-ML-KEM-header.patch

@@ -0,0 +1,29 @@
+From 98b133c54c5e3f66f46a5bb11c9b09d06fdc8469 Mon Sep 17 00:00:00 2001
+From: Tobias Brunner <tobias@strongswan.org>
+Date: Fri, 26 Jun 2026 08:10:16 +0200
+Subject: [PATCH] wolfssl: Adapt to removed ML-KEM header
+
+The mlkem.h header that mainly defined aliases for the old wc_Kyber* API
+has been removed and its contents moved to the wc_mlkem.h header.
+
+Upstream: https://github.com/strongswan/strongswan/commit/98b133c54c5e3f66f46a5bb11c9b09d06fdc8469.patch
+Signed-off-by: Thomas Perale <thomas.perale@mind.be>
+---
+ src/libstrongswan/plugins/wolfssl/wolfssl_kem.c | 3 ---
+ 1 file changed, 3 deletions(-)
+
+diff --git a/src/libstrongswan/plugins/wolfssl/wolfssl_kem.c b/src/libstrongswan/plugins/wolfssl/wolfssl_kem.c
+index 042a7e70616..786aecab4cd 100644
+--- a/src/libstrongswan/plugins/wolfssl/wolfssl_kem.c
++++ b/src/libstrongswan/plugins/wolfssl/wolfssl_kem.c
+@@ -25,10 +25,7 @@
+ 
+ #ifdef WOLFSSL_HAVE_MLKEM
+ 
+-#include <wolfssl/wolfcrypt/mlkem.h>
+-#ifdef WOLFSSL_WC_MLKEM
+ #include <wolfssl/wolfcrypt/wc_mlkem.h>
+-#endif
+ 
+ typedef struct private_key_exchange_t private_key_exchange_t;
+