gnu: containerd: Fix build.

Fixes: guix/guix#1165

* gnu/packages/patches/containerd-fix-includes.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register patch.
* gnu/packages/docker.scm (containerd)[source]: Use patch.

Change-Id: Ib6dc3d2bd7ab5de7726dce07ca904c9f27a492e7

gnu/local.mk

@@ -1152,6 +1152,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/combinatorial-blas-io-fix.patch		\
   %D%/packages/patches/compsize-fix-btrfs-progs-compatibility.patch	\
   %D%/packages/patches/containerd-create-pid-file.patch	\
+  %D%/packages/patches/containerd-fix-includes.patch            \
   %D%/packages/patches/converseen-hide-updates-checks.patch	\
   %D%/packages/patches/converseen-hide-non-free-pointers.patch	\
   %D%/packages/patches/cool-retro-term-wctype.patch		\

gnu/packages/docker.scm

@@ -203,7 +203,8 @@ Python without keeping their credentials in a Docker configuration file.")
        (sha256
         (base32 "1m31y00sq2m76m1jiq4znws8gxbgkh5adklvqibxiz1b96vvwjk8"))
        (patches
-        (search-patches "containerd-create-pid-file.patch"))))
+        (search-patches "containerd-create-pid-file.patch"
+                        "containerd-fix-includes.patch"))))
     (build-system go-build-system)
     (arguments
      (let ((make-flags #~(list (string-append "VERSION=" #$version)

gnu/packages/patches/containerd-fix-includes.patch

@@ -0,0 +1,11 @@
+diff -u -r a/vendor/github.com/containerd/btrfs/btrfs.c b/vendor/github.com/containerd/btrfs/btrfs.c
+--- a/vendor/github.com/containerd/btrfs/btrfs.c	2025-07-11 22:08:17.013769624 +0200
++++ b/vendor/github.com/containerd/btrfs/btrfs.c	2025-07-11 22:24:52.906525426 +0200
+@@ -15,6 +15,7 @@
+ */
+ 
+ #include <stddef.h>
++#include <string.h>
+ #include <linux/magic.h>
+ #include <btrfs/ioctl.h>
+ #include <btrfs/ctree.h>