Upgrade readline to 8.0

[jhpalmieri]

This helps build with Xcode 12 on OS X.

https://ftp.gnu.org/gnu/readline/readline-8.0.tar.gz

CC: @embray

Component: packages: standard

Author: John Palmieri

Branch/Commit: 3e7b084

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/30603

[jhpalmieri]

comment:1

The file sigsetjmp.patch doesn't apply anymore, so I removed it. The new version needs to be tested on various platforms, including cygwin (which is what this patch was for, apparently).

[jhpalmieri]

Author: John Palmieri

[jhpalmieri]

Branch: u/jhpalmieri/readline-8.0

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

3e7b084

readline: add upstream_url field

[sagetrac-git]

Commit: 3e7b084

[jhpalmieri]

comment:5

Marking as critical since there is a working homebrew package that can be used in place of Sage's readline.

[mkoeppe]

comment:6

This seems to work well, as tested for example in https://github.com/mkoeppe/sage/actions/runs/268683330

[mkoeppe]

Reviewer: Matthias Koeppe

[mkoeppe]

comment:7

(The package builds correctly on cygwin-minimal (https://github.com/mkoeppe/sage/runs/1154771531).)

[jhpalmieri]

comment:8

Replying to @mkoeppe:

(The package builds correctly on cygwin-minimal (https://github.com/mkoeppe/sage/runs/1154771531).)

Great, thank you for checking that!

[vbraun]

Changed branch from u/jhpalmieri/readline-8.0 to 3e7b084