Daniel,
I also think that your compiler can not find the proper libraries. Mind you that eg. -lxil will evaluate to libxil.a.
A library path is indicated with the -L option.
On github you find a complete project for Zynq 7000 and the secure library.
On freertos.org there is an old ZIP file that contains a working Zynq project. It can be used for Microzed, see “FreeRTOS-Plus/Demo/FreeRTOS_Plus_TCP_and_FAT_Zynq_SDK”. It also contains an FTP and a HTML server. Do not use the library sources from the 2016 ZIP file, it’s a bit old by now.
You will find documentation about how to use it on freertos.org.
Any further questions about FreeRTOS+TCP can be asked here.