hexchat: adjust for removal of static buffer from HMAC()

net/hexchat/Makefile

@@ -3,7 +3,7 @@ V =			2.16.2
 DISTNAME =		hexchat-$V
 EXTRACT_SUFX =		.tar.xz
 CATEGORIES =		net x11
-REVISION =		1
+REVISION =		2
 
 HOMEPAGE =		https://hexchat.github.io/
 

net/hexchat/patches/patch-src_common_util_c

@@ -0,0 +1,20 @@
+Index: src/common/util.c
+--- src/common/util.c.orig
++++ src/common/util.c
+@@ -1435,6 +1435,7 @@ challengeauth_response (const char *username, const ch
+ 	char *passhash;
+ 	char *key;
+ 	char *keyhash;
++	unsigned char md[EVP_MAX_MD_SIZE];
+ 	unsigned char *digest;
+ 	GString *buf = g_string_new_len (NULL, SHA256_DIGEST_LENGTH * 2);
+
+@@ -1451,7 +1452,7 @@ challengeauth_response (const char *username, const ch
+ 	keyhash = str_sha256hash (key);
+ 	g_free (key);
+
+-	digest = HMAC (EVP_sha256 (), keyhash, strlen (keyhash), (unsigned char *) challenge, strlen (challenge), NULL, NULL);
++	digest = HMAC (EVP_sha256 (), keyhash, strlen (keyhash), (unsigned char *) challenge, strlen (challenge), md, NULL);
+ 	g_free (keyhash);
+
+ 	for (i = 0; i < SHA256_DIGEST_LENGTH; i++)