can-utils: bump to version 2018.02.0

Disable for musl. can-utils now uses the error() glibc extension.

Use Makefile as license file.

Change homepage link to the github repo. The README.md file is much more
informative than the elinux.org wiki page.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>