message: tinyformat: force USE_VARIADIC_TEMPLATES
  Now that we started using c++11, force use of variadic templates.
  The autodetection may be wonky on some compilers, see discussion
  [here](https://github.com/bitcoin/bitcoin/pull/7982#issuecomment-216222357)
  and is unnecessary for us anyhow.
diff: @@ -113,7 +113,7 @@ namespace tfm = tinyformat;
  // Define for C++11 variadic templates which make the code shorter & more
  // general. If you don't define this, C++11 support is autodetected below.
  -// #define TINYFORMAT_USE_VARIADIC_TEMPLATES
  +#define TINYFORMAT_USE_VARIADIC_TEMPLATES
  //------------------------------------------------------------------------------
  