There are now updated patches available for VMware Workstation 15.5.2, at https://github.com/mkubecek/vmware-host-modules/tree/workstation-15.5.2

I have applied these, and VMware 15.5.2 vmmon/vmnet now compile cleanly again, with Kernels 5.5.9 and 5.6.0-rc5.

Robert Gadsdon.   March 14th 2020.