Cast _timezone to int from time_t for Cygwin.

src/interfaces/ecpg/pgtypeslib/dt.h

@@ -220,7 +220,11 @@ do { \
 #if !defined(__CYGWIN__) && !defined(WIN32)
 #define TIMEZONE_GLOBAL timezone
 #else
+#if defined(WIN32)
 #define TIMEZONE_GLOBAL _timezone
+#else
+#define TIMEZONE_GLOBAL ((int)_timezone)	/* time_t on Cywgin */
+#endif
 #define tzname _tzname			/* should be in time.h? */
 #endif