util-linux: fix ncurses/wchar handling (again)

util-linux: fix ncurses/wchar handling (again)

Since commit 006a328ad6bed214ec3c4d92120510ea37329dd1 ("util-linux: fix
build with ncurses"), we have a build failure that occurs with musl and
uClibc-ng toolchains when wide-char support is not enabled in ncurses.

The problem occurs because util-linux #defines its own wchar_t (as char)
when configured without widechar support. It was fixed upstream, so pull
the corresponding patch from the util-linux git repository.

Fixes:
  http://autobuild.buildroot.net/results/3a2f228e0fa7b5cc28a13d49f48f1a6aef8d9d7a
  http://autobuild.buildroot.net/results/99e96069f652d511c6212a5bb6be29e68fb1747c
  http://autobuild.buildroot.net/results/2dc5721aef93b7b410153bafad78248fac3db941
  http://autobuild.buildroot.net/results/8a9e197ba7a292b18f8c0c36dca974685556a38a

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