Add various headers to unbreak compilation

sysdeps/openbsd/open.c

@@ -21,6 +21,7 @@
 
 #include <config.h>
 #include <sys/types.h>
+#include <sys/sysctl.h>
 #include <glibtop.h>
 #include <glibtop/open.h>
 #include <glibtop/cpu.h>

sysdeps/openbsd/procopenfiles.c

@@ -42,6 +42,7 @@
 #include <arpa/inet.h>
 #include <string.h>
 #include <stdlib.h>
+#include <kvm.h>
 
 #include "glibtop_private.h"
 

sysdeps/openbsd/suid_open.c

@@ -27,6 +27,9 @@
 #include <glibtop/init_hooks.h>
 #include <glibtop/machine.h>
 
+#include <fcntl.h>
+#include <kvm.h>
+
 /* !!! THIS FUNCTION RUNS SUID ROOT - CHANGE WITH CAUTION !!! */
 
 void

sysdeps/openbsd/uptime.c

@@ -26,6 +26,8 @@
 
 #include <glibtop/cpu.h>
 
+#include <sys/sysctl.h>
+
 static const unsigned long _glibtop_sysdeps_uptime =
 (1L << GLIBTOP_UPTIME_UPTIME) + (1L << GLIBTOP_UPTIME_IDLETIME) +
 (1UL << GLIBTOP_UPTIME_BOOT_TIME);