Revert "Fix mktemp options for PEM file creation"

This reverts commit d9ee56d0.

After updating coreutils-gplv2 package to version 6.9-0co17, it contains mktemp compatible with a previous options used for mktemp. Reverting the commit allows to have additional point for checking the compatibility of coreutils-gplv2 with more recent versions of coreutils.

Signed-off-by: Denis Pynkin denis.pynkin@collabora.com