package: update comments for reverse dependencies of util-linux

package: update comments for reverse dependencies of util-linux

Commit 006a328ad6be ("util-linux: fix build with ncurses") removed
dependency on BR2_USE_WCHAR, but failed to update the reverse
dependencies of util-linux.

This commit updates comments in Config.in for BR2_USE_WCHAR for reverse
dependencies of util-linux which directly uses wchar now or when it is
pulled from other dependencies.

eudev doesn't use wchar directly, but needs C99 compiler. Autotools
generate code with wchar_t for checking C99 compiler.

Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>