Fetch modified csplit-io-err.sh test that uses /dev/full

Author: ChrisDryden

util/fetch-gnu.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -e
+ver="9.9"
+repo=https://github.com/coreutils/coreutils
+curl -L "${repo}/releases/download/v${ver}/coreutils-${ver}.tar.xz" | tar --strip-components=1 -xJf -
+
+# backport from coreutils > 9.9
+curl ${repo}/raw/refs/heads/master/tests/mv/hardlink-case.sh > tests/mv/hardlink-case.sh
+curl ${repo}/raw/refs/heads/master/tests/mkdir/writable-under-readonly.sh > tests/mkdir/writable-under-readonly.sh
+curl ${repo}/raw/refs/heads/master/tests/cp/cp-mv-enotsup-xattr.sh > tests/cp/cp-mv-enotsup-xattr.sh #spell-checker:disable-line
+
+# Modified test that uses /dev/full instead of LD_PRELOAD (which doesn't work with Rust binaries)
+curl -L https://raw.githubusercontent.com/oech3/coreutils-1/refs/heads/patch-1/tests/csplit/csplit-io-err.sh > tests/csplit/csplit-io-err.sh