Avoid stderr message about irrelevant broken links

Irrelevant symlinks are currently those that match
*/lib/modules/*/build and */lib/modules/*/source. These two are broken in
the kernel-core package when installed without the devel packages and it
does not cause any harm.

Downstream-only patch, the upstream code has changed.

Resolves: rhbz2119501

rear-bz2119501.patch

@@ -0,0 +1,39 @@
+diff --git a/usr/share/rear/build/default/490_fix_broken_links.sh b/usr/share/rear/build/default/490_fix_broken_links.sh
+index 5bace664..cf960be8 100644
+--- a/usr/share/rear/build/default/490_fix_broken_links.sh
++++ b/usr/share/rear/build/default/490_fix_broken_links.sh
+@@ -7,6 +7,23 @@
+ # see https://github.com/rear/rear/issues/1638
+ # and https://github.com/rear/rear/pull/1734
+ 
++# Some broken symlinks are expected. The 'build' and 'source' symlinks in kernel modules point to kernel sources
++# and are broken untol one installs the kernel-debug-devel or kernel-devel packages (on Fedora) and even then
++# the targets are jot included in the rescue system by default.
++# Do not warn about those, it is just noise.
++local irrelevant_symlinks=( '*/lib/modules/*/build' '*/lib/modules/*/source' )
++function symlink_is_irrelevant () {
++    for i in "${irrelevant_symlinks[@]}"; do
++        # do not quote $i, it is a glob pattern, matching will be performed by [[ ... == ... ]]
++        # quoting inside [[ ]] prevents pattern matching
++        if [[ "$1" == $i ]]; then
++            return 0
++        fi
++    done
++    return 1
++}
++
++
+ # FIXME: The following code fails if symlinks or their targets contain characters from IFS (e.g. blanks),
+ # cf. the same kind of comments in build/default/990_verify_rootfs.sh
+ # and layout/prepare/GNU/Linux/130_include_mount_subvolumes_code.sh
+@@ -38,6 +55,10 @@ pushd $ROOTFS_DIR
+     local broken_symlink=''
+     local link_target=''
+     for broken_symlink in $broken_symlinks ; do
++        if symlink_is_irrelevant "$broken_symlink" ; then
++            DebugPrint "Ignoring irrelevant broken symlink $broken_symlink"
++            continue
++        fi
+         # For each broken symlink absolute path inside ROOTFS_DIR
+         # we call "readlink -e" in the original system to get its link target there.
+         # If in the original system there was a chain of symbolic links like

rear.spec

@@ -37,6 +37,7 @@ Patch46: rear-bz2096916.patch
 Patch47: rear-bz2096900.patch
 Patch48: rear-bz2111059.patch
 Patch49: rsync-output.patch
+Patch50: rear-bz2119501.patch
 
 # rear contains only bash scripts plus documentation so that on first glance it could be "BuildArch: noarch"
 # but actually it is not "noarch" because it only works on those architectures that are explicitly supported.