Hi all,
I have had exactly the same issue on Win2k8R2 and SQL-Server2012:
[Microsoft][SQL Server Native Client 11.0][SQL Server]Cannot find the object "DDLOG" because it does not exist or you do not have permissions.
To fix this:
you dont need to create DDLOG table manually and/or modify the SAPSPROT.TSK file !
Problem:
InstMaster Kernel for NW 7.30 (51044252_4) comes with a very old Kernelversion = 7.20 PL 68.
The lib_dbsl library (dbmssslib.dll also with PL68) was not aware of the SQL Server native client software for SQL Server version 11.0 and the import fails.
Check also SNote: 1513170 - Miscellaneous changes for SQL Server 2012 support
Solution:
Just download the latest Kernel 720 (or Kernel 721) and copy it to
<DriveLetter> :\usr\sap\<SID>\SYS\exe\uc\NTAMD64
retry sapinst and after 10 Mins enjoy below nice message 
Execution of
SAP NetWeaver 7.3 > MS SQL Server > SAP Systems > Application Server ABAP > Standard System > Standard System
has completed.
Br,
Şahin Güney