Revert "Adjust to strncpy removal in linux 7.2-rc1"
There is another repository at https://github.com/asterisk/dahdi-linux that appears to be compatible to linux >= 2.6 and we want to in theory merge everything from our repo into that at some point. strscpy isn't available in such early linux versions yet, so revert commit b1bc81f8077c5cb52eae7fbd4021bf180159aed7 and add a different fix for building with 7.2-rc1 as next patch.
