tests: fix compilation of tests on FreeBSD 11

Some includes were missing in .h files, and the tests must be linked
with intl and execinfo on FreeBSD.

src/core/wee-config.h

@@ -23,6 +23,7 @@
 
 #include <regex.h>
 #include <wctype.h>
+
 #include "wee-config-file.h"
 
 struct t_gui_buffer;

src/core/wee-hdata.h

@@ -20,6 +20,8 @@
 #ifndef WEECHAT_HDATA_H
 #define WEECHAT_HDATA_H 1
 
+#include <time.h>
+
 #define HDATA_VAR(__struct, __name, __type, __update_allowed,           \
                   __array_size, __hdata_name)                           \
     hdata_new_var (hdata, #__name, offsetof (__struct, __name),         \

src/core/wee-hook.h

@@ -22,6 +22,7 @@
 #define WEECHAT_HOOK_H 1
 
 #include <unistd.h>
+#include <time.h>
 
 #ifdef HAVE_GNUTLS
 #include <gnutls/gnutls.h>

src/core/wee-infolist.h

@@ -20,6 +20,8 @@
 #ifndef WEECHAT_INFOLIST_H
 #define WEECHAT_INFOLIST_H 1
 
+#include <time.h>
+
 /* list structures */
 
 enum t_infolist_type

src/core/wee-util.h

@@ -20,6 +20,8 @@
 #ifndef WEECHAT_UTIL_H
 #define WEECHAT_UTIL_H 1
 
+#include <time.h>
+
 #ifdef HAVE_SYS_RESOURCE_H
 struct t_rlimit_resource
 {

src/core/weechat.h

@@ -26,6 +26,7 @@
 #endif
 
 #include <stdio.h>
+#include <time.h>
 #include <sys/time.h>
 #include <signal.h>