Convert to libedit so everyone can redistribute (second pass)

[NTULINUX]

libedit uses BSD, making it fully compatible with mixing with GPL.

[andypugh]

Should there also be a change to debian/configure?
https://github.com/LinuxCNC/linuxcnc/blob/master/debian/configure#L75
(Which looks like it will propagate into debian/control as a build-dep)
https://github.com/LinuxCNC/linuxcnc/blob/master/debian/control.top.in#L33

[rene-dev]

I think this can also be removed:
https://github.com/LinuxCNC/linuxcnc/blob/master/src/configure.ac#L129-L138

[NTULINUX]

Should there also be a change to debian/configure? https://github.com/LinuxCNC/linuxcnc/blob/master/debian/configure#L75 (Which looks like it will propagate into debian/control as a build-dep) https://github.com/LinuxCNC/linuxcnc/blob/master/debian/control.top.in#L33

https://packages.debian.org/trixie/libeditreadline-dev depends on libedit-dev so the actual package will automatically be installed if libeditreadline-dev is.

[NTULINUX]

Thank you so much, Andy!