Bug#900447: Build against freerdp2

[Disease Agent]

Porting to freerdp2 seems pretty much done:
https://issues.apache.org/jira/browse/GUACAMOLE-249?focusedCommentId=17015533&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17015533
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