einfo: missing includes from IWYU

src/einfo/einfo.c

@@ -12,20 +12,17 @@
 
 #define SYSLOG_NAMES
 
-#include <sys/types.h>
 #include <sys/time.h>
-
 #include <errno.h>
 #include <ctype.h>
 #include <inttypes.h>
-#include <stdbool.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <signal.h>
 #include <string.h>
 #include <syslog.h>
 #include <time.h>
-#include <unistd.h>
+#include <strings.h>
 
 #include "einfo.h"
 #include "helpers.h"