Reenable Vc for clang-7 toolchains.
Cmake will now refuse an incompatible vc version with clang 7+
Reverts !29 (merged)
See also core/dune-common!591 (merged)
Edited by Jö Fahlke
Cmake will now refuse an incompatible vc version with clang 7+
Reverts !29 (merged)
See also core/dune-common!591 (merged)