Clean up header guards that don't match their file name

Header guard symbols should match their file name to make guard
collisions less likely.

Cleaned up with scripts/clean-header-guards.pl, followed by some
renaming of new guard symbols picked by the script to better ones.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20220506134911.2856099-2-armbru@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[Change to generated file ebpf/rss.bpf.skeleton.h backed out]
diff --git a/plugins/plugin.h b/plugins/plugin.h
index b13677d..5eb2fdb 100644
--- a/plugins/plugin.h
+++ b/plugins/plugin.h
@@ -9,8 +9,8 @@
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-#ifndef PLUGIN_INTERNAL_H
-#define PLUGIN_INTERNAL_H
+#ifndef PLUGIN_H
+#define PLUGIN_H
 
 #include <gmodule.h>
 #include "qemu/qht.h"
@@ -97,4 +97,4 @@
 
 void exec_inline_op(struct qemu_plugin_dyn_cb *cb);
 
-#endif /* _PLUGIN_INTERNAL_H_ */
+#endif /* PLUGIN_H */