add cuda host compiler warning

Dominik Thoennesrequested to merge
thoennes/add-cuda-warning into master

check_language(cuda) also checks if the host compiler is compatible. However, this is "hidden" inside the CMakeFiles/CMakeError.log file. This MR introduces a hint to check that file if cuda is not found closes #146 (closed) closes !521 (closed) can be closes in favour of this MR

Edited by Dominik Thoennes

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