xmlseclibs: Remove SAML20 and Shib13 specific appendSignature, and replace with original.
xmlseclibs: Remove SAML20 and Shib13 specific appendSignature, and replace with original.


newmen/saml2,simplesamlphp/saml2,cb8/saml2,ArtemTeleshev/php-saml2,madmatt/saml2,sgomez/saml2,sitya/saml2