Fix issues with year 2038 (#3052)

* Fix annotations in year 2038

Fixes #3050

* Ensure 32-bit systems work better after 2038

Without this patch, their 32-bit signed long int could overflow.

This patch was done while working on reproducible builds for openSUSE.

src/feedback.cpp

@@ -52,7 +52,7 @@ std::string renderAttribute (const std::string& name, const std::string& value,
         col->type () == "date" &&
         value != "")
     {
-      Datetime d ((time_t)strtol (value.c_str (), nullptr, 10));
+      Datetime d ((time_t)strtoll (value.c_str (), nullptr, 10));
       if (format == "")
         return d.toString (Context::getContext ().config.get ("dateformat"));