implemented amb27 (SQL_Rewind)

fixed builds

dlls/mysqlx/mysql/ISQLDriver.h

@@ -57,6 +57,10 @@ namespace SourceMod
 		 *  call IsDone() after each call to NextRow().
 		 */
 		virtual void NextRow() =0;
+		/**
+		 * Rewinds to the first row.
+		 */
+		virtual void Rewind() =0;
 	};
 
 	struct QueryInfo

dlls/mysqlx/mysql/MysqlResultSet.cpp

@@ -147,3 +147,9 @@ void MysqlResultSet::NextRow()
 		m_kRow.m_Lengths = lengths;
 	}
 }
+
+void MysqlResultSet::Rewind()
+{
+	mysql_data_seek(m_pRes, 0);
+	NextRow();
+}

dlls/mysqlx/mysql/MysqlResultSet.h

@@ -43,6 +43,7 @@ namespace SourceMod
 		bool IsDone();
 		IResultRow *GetRow();
 		void NextRow();
+		void Rewind();
 	private:
 		MYSQL_RES *m_pRes;
 		MysqlResultRow m_kRow;