[spe] dftb+ should not be compiled with mpi

@_Franco Bonafe|34 said:

@_**Cristian Le|78** [said](https://zulip.mpsd.mpg.de/#narrow/stream/22-octopus/topic/dftbplus/near/61191):
````quote
@**Franco Bonafe** There is a different issue with upstream dftb+ though:
```
***  Converting input from parser version  5 to parser version 10 ...
***  Done.
Reading SK-files:
./C-C.skf
./C-H.skf
./H-H.skf
Done.
ERROR!
-> This DFTB+ binary has been compiled with MPI settings and  electron dynamics are not currently available for distributed parallel calculations.
Path: dftbplusinput/ElectronDynamics
```
````

The DFTB+ binary should NOT be compiles with MPI, this was the case before, and someone must have changed it.