add opt-in macro for arch conversion The Debian patch that loads code objects built for a particular ISA on all compatible hardware not supported upstream, so for a header-only library like rocprim it seems prudent to make behaviour depending on that to be opt-in.
disable test_warp_sort on ppc64el This test fails to build on ppc64el with clang-17. It seems as if the host platform affects the compiler optimization passes that are enabled for device code.
verbose build Some rocprim source files are large enough that they've been split into slices to try to compile faster. However, they're still quite slow to build on the older buildd machines. The verbose flag ensures that a message is printed every time the compiler finishes building a translation unit for each GPU architecture, which should help prevent timeouts if the build is still making forward progress.
