fix build (mutex header missing)

libdevcrypto/Common.cpp

@@ -20,8 +20,8 @@
  * @date 2014
  */
 
-
 #include <random>
+#include <mutex>
 #include "EC.h"
 #include "SHA3.h"
 #include "FileSystem.h"

libdevcrypto/EC.cpp

@@ -21,17 +21,6 @@
  * ECDSA, ECIES
  */
 
-#pragma warning(push)
-#pragma warning(disable:4100 4244)
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wconversion"
-#pragma GCC diagnostic ignored "-Wunused-parameter"
-#pragma GCC diagnostic ignored "-Wunused-variable"
-#pragma GCC diagnostic ignored "-Wdelete-non-virtual-dtor"
-#pragma GCC diagnostic ignored "-Wextra"
-#include <files.h>
-#pragma warning(pop)
-#pragma GCC diagnostic pop
 #include <secp256k1/secp256k1.h>
 #include "CryptoPP.h"
 #include "SHA3.h"