GUAC-852: Make checks for FreeRDP libs non-fatal. Additionally check for libfrerdp + libfreerdp-client (replaces libfreerdp-core on master).
GUAC-852: Make checks for FreeRDP libs non-fatal. Additionally check for libfrerdp + libfreerdp-client (replaces libfreerdp-core on master).

massuda-marcelo/guacamole-server,flangelo/guacamole-server,TheAxnJaxn/guacamole-server,abligh/guacamole-server,flangelo/guacamole-server,qiangyee/guacamole-server,mike-jumper/incubator-guacamole-server,wcypierre/guacamole-server,TribeMedia/guacamole-server,TribeMedia/guacamole-server,AIexandr/guacamole-server,wcypierre/guacamole-server,AIexandr/guacamole-server,hernan604/guacamole-server,massuda-marcelo/guacamole-server,hernan604/guacamole-server,AIexandr/guacamole-server,glyptodon/guacamole-server,abligh/guacamole-server,TheAxnJaxn/guacamole-server,abligh/guacamole-server,TheAxnJaxn/guacamole-server,flangelo/guacamole-server,abligh/guacamole-server,glyptodon/guacamole-server,TribeMedia/guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,qiangyee/guacamole-server,TribeMedia/guacamole-server,flangelo/guacamole-server,apache/guacamole-server,hernan604/guacamole-server,apache/guacamole-server,qiangyee/guacamole-server,massuda-marcelo/guacamole-server,TheAxnJaxn/guacamole-server,wcypierre/guacamole-server,qiangyee/guacamole-server,apache/guacamole-server,mike-jumper/incubator-guacamole-server,wcypierre/guacamole-server,AIexandr/guacamole-server,hernan604/guacamole-server,mike-jumper/incubator-guacamole-server,massuda-marcelo/guacamole-server