[BUILD] don't ignore errors on install
It seems to me that when creating directories on install
the only error that can be safely ignored is chown. Or more
to the point, its the only one that may fail under normal circumstances.

Also, I believe that mkdir -p will not producec errors if
the directory already exists, so there is no need to check for
its existance.

Signed-off-by: Simon Horman <horms@verge.net.au>

Mercurial revision: b6071fe20e54514f882f6f6bcbb51557760a7973