That is what the default libxmlsec error handler,
xmlSecMSCryptoErrorsDefaultCallback(), does. Why show less information
in our own handler?

Also, bin a copy-pasted comment that is meaningless here and a useless 'using'.

Change-Id: Ibc9f9b5066536d0f5cabbf2bda6d1fa14eca5613
Reviewed-on: https://gerrit.libreoffice.org/31159Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>