This was added in commit ebd1b95b
(INTEGRATION: CWS xmlsec08 (1.1.2); FILE ADDED; 2005-03-10) without any
real commit message to explain why this is necessary.

system-xmlsec (not containing this patch) works fine for our XML signing
purposes with software certificates, and just recently I learned that
even hardware-based certificates work fine without this patch, so it can
go away.

I assume this was a refactor to allow some new feature as a next step,
but that feature was never implemented.

Change-Id: I31639230483cd34b14b35fd41b4fcd8284476138
Reviewed-on: https://gerrit.libreoffice.org/55296Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>