clang-tidy: Fix all remaining misc-include-cleaner violations

- Remove unused includes
- Add common false positive headers to misc-include-cleaner.IgnoreHeaders
- Add IWYU pragma keep for uncommon false positive headers

src/nsresourced/bpf/userns-restrict/userns-restrict-skel.h

@@ -7,7 +7,7 @@
  * fine given that LGPL-2.1-or-later downgrades to GPL if needed.
  */
 
-#include "bpf-dlopen.h"
+#include "bpf-dlopen.h"                                 /* IWYU pragma: keep */
 
 /* libbpf is used via dlopen(), so rename symbols */
 #define bpf_object__attach_skeleton sym_bpf_object__attach_skeleton
@@ -15,4 +15,4 @@
 #define bpf_object__load_skeleton sym_bpf_object__load_skeleton
 #define bpf_object__open_skeleton sym_bpf_object__open_skeleton
 
-#include "bpf/userns-restrict/userns-restrict.skel.h"
+#include "bpf/userns-restrict/userns-restrict.skel.h"   /* IWYU pragma: export */

src/nsresourced/nsresourced-manager.c

@@ -8,6 +8,7 @@
 #include "bpf-dlopen.h"
 #if HAVE_VMLINUX_H
 #include "bpf-link.h"
+#include "bpf/userns-restrict/userns-restrict-skel.h"
 #endif
 #include "build-path.h"
 #include "common-signal.h"
@@ -26,7 +27,6 @@
 #include "set.h"
 #include "signal-util.h"
 #include "socket-util.h"
-#include "stdio-util.h"
 #include "string-util.h"
 #include "strv.h"
 #include "time-util.h"

src/nsresourced/userns-restrict.c

@@ -2,6 +2,10 @@
 
 #include <sys/stat.h>
 
+#if HAVE_VMLINUX_H
+#include "bpf/userns-restrict/userns-restrict-skel.h"
+#endif
+
 #include "bpf-dlopen.h"
 #include "bpf-link.h"
 #include "fd-util.h"

src/nsresourced/userns-restrict.h

@@ -3,11 +3,7 @@
 
 #include "shared-forward.h"
 
-#if HAVE_VMLINUX_H
-#include "bpf/userns-restrict/userns-restrict-skel.h"
-#else
 struct userns_restrict_bpf;
-#endif
 
 int userns_restrict_install(bool pin, struct userns_restrict_bpf **ret);
 struct userns_restrict_bpf *userns_restrict_bpf_free(struct userns_restrict_bpf *obj);