Add prototype for EvalScript() to script.h

This is needed for the script unit tests.

src/script.h

@@ -691,6 +691,7 @@ public:
 
 
 
+bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType);
 
 bool IsStandard(const CScript& scriptPubKey);
 bool IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);