```
devel/libgtop: Fix build on 13-CURRENT >= 1300062
Changes to the virtual memory subsystem in 13.0-CURRENT r355491 has changed the API, as it is no longer a circular array. This broke the devel/libgtop port on these systems.
Patch by: dougm,Submitted by: Neel Chauhan <neel AT neelc DOT org> (based on patch by dougm)
Submitted Reviewed_by: Neel Chauhan <neel AT neelc DOT org>koobs
Approved by:
Differential_Revision: D22929
MFH: 2020Q1
```