message: Remove use of std::to_string in Catch2 for the sake of Android
diff: @@ -8018,7 +8018,7 @@ namespace Floating {
  }
  std::string WithinUlpsMatcher::describe() const {
  - return "is within " + std::to_string(m_ulps) + " ULPs of " + ::Catch::Detail::stringify(m_target) + ((m_type == FloatingPointKind::Float)? "f" : "");
  + return "is within " + ::Catch::Detail::stringify(m_ulps) + " ULPs of " + ::Catch::Detail::stringify(m_target) + ((m_type == FloatingPointKind::Float)? "f" : "");
  }
  }// namespace Floating
  