scripts/chroot-fixups/rpm-macros.sh: avoid use of /dev/stderr

... which results in the following error:

    /var/tmp/rpm-tmp.0DE51f: line 81: /dev/stderr: Permission denied

... while scanning python-flit-3.0.0-3.el9

Author: kdudka

scripts/chroot-fixups/rpm-macros.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+file="/usr/lib/rpm/macros.d/macros.pyproject"
+if [ -w ${file} ]; then
+    (set -x; sed -e 's|> */dev/stderr|>\&2|' -i ${file})
+fi