gnu: knot: Update to 2.8.0.

* gnu/packages/dns.scm (knot): Update to 2.8.0.
[source]: Add patch.
* gnu/packages/patches/knot-include-system-lmdb-header.patch:
New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -929,6 +929,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/kio-search-smbd-on-PATH.patch		\
   %D%/packages/patches/kmod-module-directory.patch		\
   %D%/packages/patches/kmscon-runtime-keymap-switch.patch	\
+  %D%/packages/patches/knot-include-system-lmdb-header.patch	\
   %D%/packages/patches/kpackage-allow-external-paths.patch	\
   %D%/packages/patches/kobodeluxe-paths.patch			\
   %D%/packages/patches/kobodeluxe-enemies-pipe-decl.patch	\

gnu/packages/dns.scm

@@ -569,14 +569,16 @@ Extensions} (DNSSEC).")
 (define-public knot
   (package
     (name "knot")
-    (version "2.7.6")
+    (version "2.8.0")
     (source (origin
               (method url-fetch)
               (uri (string-append "https://secure.nic.cz/files/knot-dns/"
                                   "knot-" version ".tar.xz"))
               (sha256
                (base32
-                "18lpyq3vgr2ainmfiy14x7hcf1zxza66bhkpr54jaz2gy1viijx1"))
+                "1vw7xx7bm440jwrpvdd04vrp6ccz2b11swcn9msvs62hf0kdjjj9"))
+              (patches
+               (search-patches "knot-include-system-lmdb-header.patch"))
               (modules '((guix build utils)))
               (snippet
                '(begin

gnu/packages/patches/knot-include-system-lmdb-header.patch

@@ -0,0 +1,34 @@
+From: Tobias Geerinckx-Rice <me@tobias.gr>
+Date: Wed, 20 Mar 2019 00:08:00 +0100
+Subject: [PATCH] gnu: knot: Include system <lmdb.h>.
+
+Copied verbatim from Knot master[0].
+
+[0]: https://gitlab.labs.nic.cz/knot/knot-dns/commit/b557430cffbb1c6b30617a394b02acc514e7e536
+
+From b557430cffbb1c6b30617a394b02acc514e7e536 Mon Sep 17 00:00:00 2001
+From: Daniel Salzman <daniel.salzman@nic.cz>
+Date: Wed, 6 Mar 2019 17:35:44 +0100
+Subject: [PATCH] journal: include proper header <lmdb.h>
+
+fixes #638
+---
+ src/knot/journal/knot_lmdb.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/knot/journal/knot_lmdb.h b/src/knot/journal/knot_lmdb.h
+index 35a88845c..b1d09cbb4 100644
+--- a/src/knot/journal/knot_lmdb.h
++++ b/src/knot/journal/knot_lmdb.h
+@@ -16,7 +16,7 @@
+ 
+ #pragma once
+ 
+-#include "contrib/lmdb/lmdb.h"
++#include <lmdb.h>
+ 
+ #include <stdbool.h>
+ #include <stdlib.h>
+-- 
+2.18.1
+