[DRE-maint] Bug#977724: libruby2.7: Build with libedit rather than readline

[Bastian Germann]

Package: libruby2.7
Version: 2.7.2-3
Severity: normal

Please consider replacing the GPL-3 licensed build dependency 
libreadline6-dev with libedit-dev, which is also supported by Ruby. The 
GPL-3 is incompatible with some licenses such as GPL-2-only. Therefore, 
a foundational package such as libruby2.7 should choose the more 
liberally licensed dependency to allow as much software in the archive 
as possible without license headaches.

Most probably, there is already a GPL-2-only ruby software in the 
archive that uses the readline module but I did not check.