Fix darcs input to use darcs-specific SCM cache dir.

Currently re-using the git cache dir which could cause overlap problems.

Created by  Kevin Quick  on September 10, 2018
AWQWZ66NDEMHS4X7TXSGSYU36QD4HBUCPB7LURSLTIT4BXFA7SSQC
In channels
main
upstream
Change contents