NEWS: Update temporary files ignored by ldconfig

Fixes commit 2aa0974d ("elf: ldconfig
should skip temporary files created by package managers") and
commit cfb5a97a ("ldconfig: Fixes for
skipping temporary files.").

Reported-by: Guillem Jover <guillem@debian.org>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>