Fix VS2013 compile warnings.

libethereum/State.cpp

@@ -698,7 +698,7 @@ bool State::call(Address _myAddress, Address _txSender, u256 _txValue, u256 _gas
 		auto out = vm.go(evm);
 		memcpy(_out.data(), out.data(), std::min(out.size(), _out.size()));
 	}
-	catch (OutOfGas const& _e)
+	catch (OutOfGas const& /*_e*/)
 	{
 		clog(StateChat) << "Out of Gas! Reverting.";
 		revert = true;

libethereum/VM.h

@@ -91,7 +91,7 @@ template <class Ext> eth::bytesConstRef eth::VM::go(Ext& _ext, uint64_t _steps)
 
 		// FEES...
 		bigint runGas = c_stepGas;
-		unsigned newTempSize = m_temp.size();
+		unsigned newTempSize = (unsigned)m_temp.size();
 		switch (inst)
 		{
 		case Instruction::SSTORE:
@@ -150,7 +150,7 @@ template <class Ext> eth::bytesConstRef eth::VM::go(Ext& _ext, uint64_t _steps)
 			unsigned inSize = (unsigned)m_stack[m_stack.size() - 3];
 			newTempSize = inOff + inSize;
 
-			unsigned wc = std::min<unsigned>(inSize / 32 * 32 + inOff, m_temp.size());
+			unsigned wc = std::min(inSize / 32 * 32 + inOff, (unsigned)m_temp.size());
 			unsigned nonZero = 0;
 			for (unsigned i = inOff; i < wc; i += 32)
 				if (!!*(h256*)(m_temp.data() + inOff))