New coreutils (8.15 onwards) build /usr/bin/realpath, which busybox also builds.
Add it to the alternatives handling to avoid file conflicts.
(From OE-Core rev: 826c18eb1c69f5e3689b5b0ef188f74ae930a050)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>