Fixed Windows warning.

Compiling on Windows 7 from a Windows SDK 7 prompt with CMake.
`nmake all test` now works with the `tzset()` warning gone.

src/time.c

@@ -28,13 +28,11 @@
 
 #ifdef _WIN32
 /* Win32 platform do not provide gmtime_r/localtime_r; emulate them using gmtime_s/localtime_s */
-#if _MVC_VER
 #define gmtime_r(tp, tm)    ((gmtime_s((tm), (tp)) == 0) ? (tm) : NULL)
 #define localtime_r(tp, tm)    ((localtime_s((tm), (tp)) == 0) ? (tm) : NULL)
 #else
 #define NO_GMTIME_R
 #endif
-#endif
 
 /* timegm(3) */
 /* mktime() creates tm structure for localtime; timegm() is for UTF time */