Fix user name detection for Windows.

This patch was given by ademin (thanks!).

http://code.google.com/p/google-glog/issues/detail?id=12


git-svn-id: https://google-glog.googlecode.com/svn/trunk@64 eb4d4688-79bd-11dd-afb4-1d65580434c0

src/utilities.cc

@@ -268,7 +268,11 @@ const string& MyUserName() {
 }
 static void MyUserNameInitializer() {
   // TODO(hamaji): Probably this is not portable.
+#if defined(OS_WINDOWS)
+  const char* user = getenv("USERNAME");
+#else
   const char* user = getenv("USER");
+#endif
   if (user != NULL) {
     g_my_user_name = user;
   } else {