shared: Fix EOF handling in freadline_wrapped #290

Job	Run time
build (meson, ubuntu:22.04, true)	1m 36s
build (meson, ubuntu:24.04, true)	1m 36s
build (meson, archlinux:base-devel, true)	1m 24s
build (meson, fedora:latest)	1m 48s
build (meson, alpine:latest, -D docs=false)	51s
build (meson, debian:unstable, true)	1m 40s
build (autotools, ubuntu:22.04, true)	1m 32s
build (autotools, ubuntu:24.04, true)	1m 53s
build (autotools, archlinux:base-devel, true)	1m 51s
build (autotools, fedora:latest)	2m 19s
build (autotools, alpine:latest, -D docs=false)	1m 28s
build (autotools, debian:unstable, true)	2m 9s
	20m 7s

Provide feedback