Upstream changes interesting for us:

- Added ECDSA-SHA1, ECDSA-SHA256, ECDSA-SHA512 support for xmlsec-nss,
  so we can drop 2 patches
- Fixed XMLSEC_KEYINFO_FLAGS_X509DATA_DONT_VERIFY_CERTS handling, which
  allows dropping xmlsec1-noverify.patch.1 in the future

Also backport a patch from xmlsec master that fixes signature creation
on Windows (the release regressed in this regard).

Change-Id: I2c14328283bf7d4f8af5595ea4c1efc29ee81f9e