rdp2tcp was wrongly exposed as cmake target. This could lead to errors
like the following when the FreeRDP2 cmake file was required:
CMake Error at ../lib/cmake/FreeRDP2/FreeRDPTargets.cmake:73 (message):
The imported target "rdp2tcp-client" references the file
".../lib/freerdp2/librdp2tcp-client.a"
but this file does not exist. Possible reasons include:
* The file was deleted, renamed, or moved to another location.
* An install or uninstall procedure did not complete successfully.
* The installation package was faulty and contained
".../lib/cmake/FreeRDP2/FreeRDPTargets.cmake"
but not all the files it references.
