BUG#39802 On Windows, 32-bit time_t should be enforced

A backport of fix for "BUG40092 - Storage engine API uses
time_t datatype".

Starting from MSVC C++ 2005 (v8), the default size of time_t
is changed from 32-bit to 64-bit. As the result, the binaries
built with pre-v8 MSVC C++ do not work with the binaries
(storage engine plugins) built with v8 or after (server
crashes).

Fixed storage engine API to use datatype with known size
(ulong) instead of time_t.

sql/handler.h:
  Bug#39802 On Windows, 32-bit time_t should be enforced
  
  Change create_time, check_time, update_time
  in the ha_statistics and PARTITION_INFO
  structures to ulong.

sql/handler.h

@@ -876,9 +876,9 @@ typedef struct {
   ulonglong delete_length;
   ha_rows records;
   ulong mean_rec_length;
-  time_t create_time;
-  time_t check_time;
-  time_t update_time;
+  ulong create_time;
+  ulong check_time;
+  ulong update_time;
   ulonglong check_sum;
 } PARTITION_INFO;
 
@@ -1037,9 +1037,9 @@ class ha_statistics
   ha_rows records;
   ha_rows deleted;			/* Deleted records */
   ulong mean_rec_length;		/* physical reclength */
-  time_t create_time;			/* When table was created */
-  time_t check_time;
-  time_t update_time;
+  ulong create_time;			/* When table was created */
+  ulong check_time;
+  ulong update_time;
   uint block_size;			/* index block size */
 
   ha_statistics():