package/cifs-utils: add optional support for keyutils

When keyutils was compiled before, cifs-utils will use it as optional
dependency:

$ output/host/usr/bin/x86_64-linux-readelf -a output/target/usr/bin/cifscreds | grep NEEDED
 0x0000000000000001 (NEEDED)             Shared library: [libkeyutils.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.1]

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>