Add include files for prototypes

Include the header with prototypes in the file that provides definitions
as well, to catch any mismatch between prototype and definition.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Closes #10470

cmd/zed/zed_event.c

@@ -28,6 +28,7 @@
 #include "zed.h"
 #include "zed_conf.h"
 #include "zed_disk_event.h"
+#include "zed_event.h"
 #include "zed_exec.h"
 #include "zed_file.h"
 #include "zed_log.h"

cmd/zed/zed_exec.c

@@ -22,6 +22,7 @@
 #include <sys/wait.h>
 #include <time.h>
 #include <unistd.h>
+#include "zed_exec.h"
 #include "zed_file.h"
 #include "zed_log.h"
 #include "zed_strings.h"

cmd/zed/zed_exec.h

@@ -16,6 +16,7 @@
 #define	ZED_EXEC_H
 
 #include <stdint.h>
+#include "zed_strings.h"
 
 int zed_exec_process(uint64_t eid, const char *class, const char *subclass,
     const char *dir, zed_strings_t *zedlets, zed_strings_t *envs,

cmd/zed/zed_file.c

@@ -20,6 +20,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include "zed_file.h"
 #include "zed_log.h"
 
 /*