util-linux: fix compilation when libc lacks wide-character support

util-linux: fix compilation when libc lacks wide-character support

A recent change in util-linux left calls to wcstok and wcspbrk not
guarded by "#ifdef HAVE_WIDECHAR". This causes build failures when
libc does not have the wide-character functions, like some uClibc
builds.

Solve the problem by means of a patch already sent upstream.

Fixes:
  http://autobuild.buildroot.net/results/fd8a1a8e0cef3aeed9588540e8e663664f6b43aa
  http://autobuild.buildroot.net/results/5ad73ea8b471321988c50d80a5e50d4504151dd6
  http://autobuild.buildroot.net/results/04411b7280dc51ecd51236967981a42352bbeb3e

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>