systemd: drop 0003-Fix-NixOS-containers.patch

This is possibile because of the preparations from b9f2fa1c7d

pkgs/os-specific/linux/systemd/0003-Fix-NixOS-containers.patch

@@ -1,31 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Eelco Dolstra <eelco.dolstra@logicblox.com>
-Date: Wed, 16 Apr 2014 10:59:28 +0200
-Subject: [PATCH] Fix NixOS containers
-
-In NixOS containers, the init script is bind-mounted into the
-container, so checking early whether it exists will fail.
----
- src/nspawn/nspawn.c | 2 ++
- 1 file changed, 2 insertions(+)
-
-diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
-index 84e94e845a..a0052c1c88 100644
---- a/src/nspawn/nspawn.c
-+++ b/src/nspawn/nspawn.c
-@@ -6368,6 +6368,7 @@ static int run(int argc, char *argv[]) {
-                                 goto finish;
-                         }
-                 } else {
-+#if 0
-                         _cleanup_free_ char *p = NULL;
- 
-                         if (arg_pivot_root_new)
-@@ -6387,6 +6388,7 @@ static int run(int argc, char *argv[]) {
-                                 log_error_errno(r, "Unable to determine if %s looks like it has an OS tree (i.e. whether /usr/ exists): %m", arg_directory);
-                                 goto finish;
-                         }
-+#endif
-                 }
- 
-                 if (userns_fd >= 0) {

pkgs/os-specific/linux/systemd/default.nix

@@ -238,7 +238,6 @@ stdenv.mkDerivation (finalAttrs: {
   # patches
   patches = [
     ./0002-Don-t-try-to-unmount-nix-or-nix-store.patch
-    ./0003-Fix-NixOS-containers.patch
     ./0004-Add-some-NixOS-specific-unit-directories.patch
     ./0005-Get-rid-of-a-useless-message-in-user-sessions.patch
     ./0006-hostnamed-localed-timedated-disable-methods-that-cha.patch