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/libsystemd/sd-journal/audit-type.c

@@ -1,7 +1,3 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
-#include <linux/audit.h>
-
-#include "audit-type.h"
-
 #include "audit_type-to-name.inc"

src/libsystemd/sd-journal/audit-type.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
-#include <stdio.h>
+#include <stdio.h>      /* IWYU pragma: keep */
 
 #include "sd-forward.h"
 

src/libsystemd/sd-journal/audit_type-to-name.awk

@@ -1,6 +1,9 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
 BEGIN{
+        print "#include <linux/audit.h>"
+        print ""
+        print "#include \"audit-type.h\""
         print "const char *audit_type_to_string(int type) {"
         print "        switch (type) {"
 }

src/libsystemd/sd-journal/journal-send.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 #pragma once
 
-#include "syslog-util.h"
+#include "syslog-util.h"        /* IWYU pragma: keep */
 
 int journal_fd_nonblock(bool nonblock);
 void close_journal_fd(void);

src/libsystemd/sd-journal/test-journal-stream.c

@@ -10,7 +10,6 @@
 #include "iovec-util.h"
 #include "journal-file-util.h"
 #include "journal-internal.h"
-#include "log.h"
 #include "parse-util.h"
 #include "rm-rf.h"
 #include "tests.h"

src/libsystemd/sd-json/json-util.h

@@ -7,7 +7,7 @@
 
 #include "sd-forward.h"
 #include "log.h"
-#include "string-util.h"
+#include "string-util.h"        /* IWYU pragma: keep */
 
 #define JSON_VARIANT_REPLACE(v, q)        \
         do {                              \

src/libsystemd/sd-netlink/netlink-types-nfnl.c

@@ -3,7 +3,7 @@
 #include <linux/if.h>
 #include <linux/netfilter/nf_tables.h>
 #include <linux/netfilter/nfnetlink.h>
-#include <linux/netlink.h>
+#include <linux/netlink.h>              /* IWYU pragma: keep */
 
 #include "netlink-types-internal.h"