bmon: Fix libncursesw dependency

When libncursesw is available, bmon uses it instead of libncurses.  This
commit adapts the dependencies accordingly.

Signed-off-by: Baptiste Jonglez <bjonglez@illyse.org>
bmon: Remove unrecognized configure flags

Signed-off-by: Baptiste Jonglez <bjonglez@illyse.org>
Merge pull request #530 from zorun/master

bmon: Fix libncursesw dependency