m4/my_lib_readline: Fix check for additional libraries
authorMarkus Armbruster <armbru@pond.sub.org>
Tue, 29 Dec 2020 04:56:12 +0000 (05:56 +0100)
committerMarkus Armbruster <armbru@pond.sub.org>
Sun, 17 Jan 2021 20:24:28 +0000 (21:24 +0100)
commite23d0f6259f32bd35594fc32f67184c06748e6af
tree5efbe540762ff5f0aaa3a0dd083f52d00eb399e0
parent882379f883aebb94371a0ecefa130160912120ec
m4/my_lib_readline: Fix check for additional libraries

MY_LIB_READLINE tries each readline-compatible library with a sequence
of additional libraries, starting with none.  If the check with none
fails, all the others checks reuse the cached result, and also fail.
Broken in commit 1cbda2c7d "client: Rewrite readline configuration",
v4.4.0.

Avoid the unwanted chaching.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
m4/my_lib_readline.m4