Before the gbuild conversion in commit
ec6af419 (convert libxmlsec to gbuild,
2012-11-29) the makefile.mk had a comment for this patch: "Disable use
of smime3 so don't need to package it".

Today smime3 is packaged (see external/nss/ExternalPackage_nss.mk), so
patching xmlsec is no longer needed.

Change-Id: I73ec13ee92a1860f5dc3cbeed0e51d42a0320baa
Reviewed-on: https://gerrit.libreoffice.org/38239Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>