core: add missing include of sys/time.h in C headers

src/core/wee-debug.h

@@ -20,6 +20,8 @@
 #ifndef WEECHAT_DEBUG_H
 #define WEECHAT_DEBUG_H
 
+#include <sys/time.h>
+
 struct t_gui_window_tree;
 
 extern void debug_sigsegv ();

src/core/wee-util.h

@@ -21,6 +21,7 @@
 #define WEECHAT_UTIL_H
 
 #include <time.h>
+#include <sys/time.h>
 
 #ifdef HAVE_SYS_RESOURCE_H
 struct t_rlimit_resource

src/plugins/weechat-plugin.h

@@ -28,6 +28,7 @@ extern "C" {
 
 #include <stddef.h>
 #include <time.h>
+#include <sys/time.h>
 #include <sys/types.h>
 #include <sys/socket.h>