package/coreutils: fix build without threads

Build of coreutils without threads is broken since bump to version 8.32
in commit b4a0f9fb

Fixes:
 - http://autobuild.buildroot.org/results/8d00bdabef73daa2a1d1f4c6e183dda447a82134



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[yann.morin.1998@free.fr:
  - do an actual backport of patch 0002
  - add upstream status for patch 0003
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>