simulator/jffs2: remove _TIME_T_DEFINED when built by VC++

_TIME_T_DEFINED was pre-defined in order to build jffs2 with VC.
While it may cause many side effects.

components/dfs/filesystems/jffs2/include/port/sys/stat.h

@@ -317,10 +317,11 @@ typedef void *cyg_io_handle_t;
 #define S_ISGID  (1<<26)
 
 #if defined(MSVC)
+/* for time_t */
+#include <time.h>
 typedef unsigned long mode_t;
 typedef unsigned int ino_t;
 typedef unsigned int dev_t;
-typedef int time_t;
 typedef long ssize_t;
 #elif defined(__CC_ARM)  
 #define mode_t unsigned long

components/dfs/filesystems/jffs2/include/port/sys/types.h

@@ -78,7 +78,11 @@ typedef unsigned short gid_t;
 typedef unsigned short uid_t;
 typedef int pid_t;
 
+#if defined(MSVC)
+#include <time.h>
+#else
 typedef int time_t;
+#endif
 //#include "os_sys_stat.h"
 #endif /* CYGONCE_ISO_SYS_TYPES_H multiple inclusion protection */