stress-ng: bump to version 0.09.47

stress-ng: bump to version 0.09.47

- Enable for uClibc, which is supported now.
- Keep microblaze, nios2 and arc restrictions, since it was not possible
  to test on those architectures (no hardware available).
- Keep musl restriction, since it was possible to compile the code (with
  some patches) but it failed at run time with

    Cannot set scheduler: errno=38 (Function not implemented)

Signed-off-by: Carlos Santos <casantos@datacom.com.br>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>