[New port request] XML Security Library

[dmn-star-home]

XML Security Library

https://github.com/lsh123/xmlsec

XMLSec library provides C based implementation for major XML Security
standards:

• XML Signature Syntax and Processing
  https://www.w3.org/TR/xmldsig-core

• XML Encryption Syntax and Processing
  https://www.w3.org/TR/xmlenc-core/
  XMLSec is based on well known LibXML (http://xmlsoft.org), LibXSLT
  (http://xmlsoft.org/XSLT) and OpenSSL (https://www.openssl.org) libraries

[PhoebeHui]

The changes has merged to vcpkg.