Is it support compiling nvexec::stream_context header with clang++?

[MoFHeka]

I want to be able to compile the nvexec runtime in nvc++, then compile the main body of the program in clang++, and then link them together. But the stream_context is created in outside the code compiled with nvc++.

[ericniebler]

clang-cuda is part of stdexec's test matrix. i do try to keep it working but only as time allows. it's not my top priority.