Add patch for https://github.com/openwall/john/pull/5185, already merged

in upstream, allowing for empty NSEC3 salt

ok sebastia@

security/john-jumbo/Makefile

@@ -4,6 +4,7 @@ FIX_EXTRACT_PERMISSIONS=Yes
 
 V =		1.9.0
 JV =		1
+REVISION =	0
 EXTRACT_SUFX =	.tar.xz
 
 DISTNAME =	john-$V-jumbo-${JV}

security/john-jumbo/patches/patch-src_nsec3_fmt_plug_c

@@ -0,0 +1,24 @@
+Index: src/nsec3_fmt_plug.c
+--- src/nsec3_fmt_plug.c.orig
++++ src/nsec3_fmt_plug.c
+@@ -67,6 +67,11 @@ struct salt_t {
+ static struct fmt_tests tests[] = {
+ 	{ "$NSEC3$100$4141414141414141$8c2d583acbe22616c69bb457e0c2111ced0a6e77$example.com.", "www" },
+ 	{ "$NSEC3$100$42424242$8fb38d13720815ed5b5fcefd973e0d7c3906ab02$example.com.", "mx" },
++	{ "$NSEC3$0$$879ffda85c7cb08df1f93fb040b90a6869b205f1$example.com.", "ns1" },
++	{ "$NSEC3$0$$c5e4b4da1e5a620ddaa3635e55c3732a5b49c7f4$example.com.", "" },
++	{ "$NSEC3$1$$4ff4345669d70dc0ab7e76c230d97de3eff75059$example.com.", "" },
++	{ "$NSEC3$0$42$e2d9498245ee0768923c1cd523959f18acbf11e7$example.com.", "ns2" },
++	{ "$NSEC3$1$42$26d83a84e2dff76c714f4e76b60355adeb045bbe$example.com.", "cdn" },
+ 	{ NULL }
+ };
+ 
+@@ -175,7 +180,7 @@ static int valid(char *ciphertext, struct fmt_main *pF
+ 				return 0;
+ 			strncpy(salt, p, q - p);
+ 			salt[q - p] = 0;
+-			if (!ishexlc(salt))
++			if (q-p > 0 && !ishexlc(salt))
+ 				return 0;
+ 			break;
+ 		case 3: