Convert time zone name to UTF8 on Windows.

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index 75b1365db527fc7d5b4a3dd8a21c7e3e3f112d38..ed0e430ce70eb9972b5aa7a17db5868422bf7151 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -412,13 +412,11 @@ void Time::TzSet() {
   }
 
   // Make standard and DST timezone names.
-  OS::SNPrintF(Vector<char>(std_tz_name_, kTzNameSize),
-               "%S",
-               tzinfo_.StandardName);
+  WideCharToMultiByte(CP_UTF8, 0, tzinfo_.StandardName, -1,
+                      std_tz_name_, kTzNameSize, NULL, NULL);
   std_tz_name_[kTzNameSize - 1] = '\0';
-  OS::SNPrintF(Vector<char>(dst_tz_name_, kTzNameSize),
-               "%S",
-               tzinfo_.DaylightName);
+  WideCharToMultiByte(CP_UTF8, 0, tzinfo_.DaylightName, -1,
+                      dst_tz_name_, kTzNameSize, NULL, NULL);
   dst_tz_name_[kTzNameSize - 1] = '\0';
 
   // If OS returned empty string or resource id (like "@tzres.dll,-211")