Is your feature request related to a problem? Please describe.
The update from 2.5 to 3.0 has broken the API integration from dftd4 with Vasp. While dftd4 2.5 can still be used with Vasp there have been various issue in the 2.5 with newer Versions of the Intel compilers (latest confirmed working version is Intel 18).

Describe the solution you'd like
To use dftd4 in the 3.x series with Vasp an update or patch for the subdftd4.F has to be provided. The API for using subdftd4.F in vdwforcefield.F don't have not change, but the glue code in subdftd4.F to access the Fortran API of dftd4.

Additional context
The currently available subdftd4.F has to be retrieved from Vasp first.