freebsd.zfsd: fix build

Co-Authored-By: Audrey Dutcher <audrey@rhelmot.io>

pkgs/os-specific/bsd/freebsd/patches/15.0/zfsd-headers.patch

@@ -0,0 +1,12 @@
+diff --git a/cddl/usr.sbin/zfsd/case_file.cc b/cddl/usr.sbin/zfsd/case_file.cc
+index 852767aeb227..69086b4a7255 100644
+--- a/cddl/usr.sbin/zfsd/case_file.cc
++++ b/cddl/usr.sbin/zfsd/case_file.cc
+@@ -49,6 +49,7 @@
+ #include <iomanip>
+ #include <fstream>
+ #include <functional>
++#include <algorithm>
+ #include <sstream>
+ #include <syslog.h>
+ #include <unistd.h>

pkgs/os-specific/bsd/freebsd/pkgs/libdevdctl.nix

@@ -11,5 +11,7 @@ mkDerivation {
     "debug"
   ];
 
+  env.NIX_CFLAGS_COMPILE = "-std=c++23 -Wno-nullability-completeness";
+
   meta.platforms = lib.platforms.freebsd;
 }

pkgs/os-specific/bsd/freebsd/pkgs/zfsd.nix

@@ -29,6 +29,8 @@ mkDerivation {
 
   MK_TESTS = "no";
 
+  env.NIX_CFLAGS_COMPILE = "-std=c++23 -Wno-nullability-completeness";
+
   meta = {
     mainProgram = "zfsd";
     platforms = lib.platforms.freebsd;