Change in the selection of the executable to clink

There is a problem in the selection of the processor architecture, the processor whether the user is 64 or 32 bits, the bit returns to %PROCESSOR_ARCHITECTURE% take several values
```
λ echo %PROCESSOR_ARCHITECTURE%
AMD64
λ echo %PROCESSOR_ARCHITECTURE%
IA64
λ echo %PROCESSOR_ARCHITECTURE%
x64
```

http://superuser.com/questions/305901/possible-values-of-processor-architecture

Now with %PROCESSOR_ARCHITECTURE:~-2% this returns :
```
λ echo %PROCESSOR_ARCHITECTURE%
AMD64
λ echo %PROCESSOR_ARCHITECTURE:~-2%
64
λ echo %PROCESSOR_ARCHITECTURE%
IA64
λ echo %PROCESSOR_ARCHITECTURE:~-2%
64
λ echo %PROCESSOR_ARCHITECTURE%
x64
λ echo %PROCESSOR_ARCHITECTURE:~-2%
64
```