ethtool 6.4 released

Hello,

ethtool 6.4 has been released.

Home page: https://www.kernel.org/pub/software/network/ethtool/
Download link:
https://www.kernel.org/pub/software/network/ethtool/ethtool-6.4.tar.xz

Release notes:
        * Feature: get/set Tx push buffer length (-G)
        * Feature: sff-8636 and cmis: report LOL / LOS / Tx Fault (-m)
        * Fix: fix duplex setting parser (-s)
        * Misc: check and require C11 language standard
        * Misc: clean up obsolete pre-build checks

Michal