tree-wide: don't ifdef seccomp-util.h, drop seccomp.h inclusion everywhere

seccomp-util.h doesn't need ifdeffing, hence don't. It has worked since
quite a while with HAVE_SECCOMP is off, hence use it everywhere.

Also drop explicit seccomp.h inclusion everywhere (which needs
HAVE_SECCOMP ifdeffery everywhere). seccomp-util.h includes it anyway,
automatically, which we can just rely on, and it deals with HAVE_SECCOMP
at one central place.

src/nspawn/nspawn-oci.c

@@ -1,9 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include <linux/oom.h>
-#if HAVE_SECCOMP
-#include <seccomp.h>
-#endif
 
 #include "bus-util.h"
 #include "cap-list.h"
@@ -19,9 +16,7 @@
 #include "nspawn-oci.h"
 #include "path-util.h"
 #include "rlimit-util.h"
-#if HAVE_SECCOMP
 #include "seccomp-util.h"
-#endif
 #include "stdio-util.h"
 #include "string-util.h"
 #include "strv.h"

src/nspawn/nspawn-seccomp.c

@@ -6,16 +6,10 @@
 #include <sys/socket.h>
 #include <sys/types.h>
 
-#if HAVE_SECCOMP
-#include <seccomp.h>
-#endif
-
 #include "alloc-util.h"
 #include "log.h"
 #include "nspawn-seccomp.h"
-#if HAVE_SECCOMP
 #include "seccomp-util.h"
-#endif
 #include "string-util.h"
 #include "strv.h"
 

src/nspawn/nspawn-settings.h

@@ -4,10 +4,6 @@
 #include <sched.h>
 #include <stdio.h>
 
-#if HAVE_SECCOMP
-#include <seccomp.h>
-#endif
-
 #include "sd-bus.h"
 #include "sd-id128.h"
 
@@ -18,6 +14,7 @@
 #include "missing_resource.h"
 #include "nspawn-expose-ports.h"
 #include "nspawn-mount.h"
+#include "seccomp-util.h"
 #include "time-util.h"
 
 typedef enum StartMode {

src/nspawn/nspawn.c

@@ -96,9 +96,7 @@
 #include "resolve-util.h"
 #include "rlimit-util.h"
 #include "rm-rf.h"
-#if HAVE_SECCOMP
 #include "seccomp-util.h"
-#endif
 #include "selinux-util.h"
 #include "signal-util.h"
 #include "socket-util.h"