net/freerdp: fix build with security/libressl after updating to 2.0.0-rc4

Still broken with libressl-devel but it is another issue. Marking as BROKEN.

PR: 234198
Submitted by: myself
Approved by: kevans (maintainer), mentors (implicit)
Obtained from: https://github.com/FreeRDP/FreeRDP/issues/5049