package/hwloc: bump to version 2.4.1

- Add ac_cv_prog_cc_c99 to avoid a build failure due to
  https://github.com/open-mpi/hwloc/commit/f2226f76e104923a76c5d09328284104abad6b01
- Update hash of COPYING, copyrights added with
  https://github.com/open-mpi/hwloc/commit/ebaa3595e2ddc6e0e94e8ea5b1472f1a21969c80
- Update indentation in hash file (two spaces)

As a side effect, this will remove numactl dependency (which raises a
build failure with sparc v8 since commit
4ed540dd) thanks to:
https://github.com/open-mpi/hwloc/commit/e6a53bbf65458fd5fe4d45d5a83027b530566591

https://github.com/open-mpi/hwloc/blob/hwloc-2.4.1/NEWS

Fixes:
 - http://autobuild.buildroot.org/results/5f9394d3bab4e83edbea9bc607c3e135adfdabbc



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>