Hotfix to make sd2card work with wireless modules

On mega2560. Currently breaks ethernet modules though.

Author: Henning Hasemann

libraries/SD/utility/Sd2Card.cpp

@@ -211,6 +211,10 @@ uint8_t Sd2Card::eraseSingleBlockEnable(void) {
  * can be determined by calling errorCode() and errorData().
  */
 uint8_t Sd2Card::init(uint8_t sckRateID, uint8_t chipSelectPin) {
+  // <HOTFIX>
+  chipSelectPin = 4;
+  // </HOTFIX>
+
   errorCode_ = inBlock_ = partialBlockRead_ = type_ = 0;
   chipSelectPin_ = chipSelectPin;
   // 16-bit init start time allows over a minute