drivers/nouveau: mention dummy.cpp to use g++ linker

The build system does not know that the static library is C++.
Mention the cpp file to trigger generation of the proper variable
and drop the hacky stdc++ linking.

Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
1 file changed