Fix the tz detection code.

source/common/putil.cpp

 /*
 ******************************************************************************
 *
 *   Copyright (C) 1997-2014, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 ******************************************************************************
 *
 *  FILE NAME : putil.c (previously putil.cpp and ptypes.cpp)
 *
@@ skipping 952 matching lines @@
                     /* Get out after the first one found. */
                     break;
                 }
             }
         }
     }
     closedir(dirp);
     return result;
 }
 #endif
+
+U_CAPI void U_EXPORT2
+uprv_tzname_clear_cache()
+{
+#if defined(CHECK_LOCALTIME_LINK) && !defined(DEBUG_SKIP_LOCALTIME_LINK)
+    gTimeZoneBufferPtr = NULL;
+#endif
+}
+
 U_CAPI const char* U_EXPORT2
 uprv_tzname(int n)
 {
     const char *tzid = NULL;
 #if U_PLATFORM_USES_ONLY_WIN32_API
     tzid = uprv_detectWindowsTimeZone();
 
     if (tzid != NULL) {
         return tzid;
     }
@@ skipping 1229 matching lines @@
 #endif /* U_ENABLE_DYLOAD */
 
 /*
  * Hey, Emacs, please set the following:
  *
  * Local Variables:
  * indent-tabs-mode: nil
  * End:
  *
  */