Revert "Print stack trace upon exceptions"

Ain't nobody got time for link/cmake skullduggery.

This reverts commit fff238ec94.

src/blockchain_db/blockchain_db.h

@@ -33,7 +33,6 @@
 #include <list>
 #include <string>
 #include <exception>
-#include "common/exception.h"
 #include "crypto/hash.h"
 #include "cryptonote_core/cryptonote_basic.h"
 #include "cryptonote_core/difficulty.h"
@@ -152,7 +151,7 @@ struct output_data_t
 /***********************************
  * Exception Definitions
  ***********************************/
-class DB_EXCEPTION : public tools::exception
+class DB_EXCEPTION : public std::exception
 {
   private:
     std::string m;