remove test-block-tridiagonal-extraction.cu
This depends on an unused/unpublished interface for tridigpu, tridigpu/block-tridiag-to-eigen-sparse.h, so it can only be assumed that this idea was not pursued.
This depends on an unused/unpublished interface for tridigpu, tridigpu/block-tridiag-to-eigen-sparse.h, so it can only be assumed that this idea was not pursued.