[MacPorts] #71516: nvtop: fix for earlier systems

[MacPorts]

#71516: nvtop: fix for earlier systems
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 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.10.5
 Keywords:                |       Port:  nvtop
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 May not be fixable for really old systems, but:

 1. Needs `legacysupport` for `clock_gettime`.
 2. Needs this fix for `get_process_info_mac.c`:
 https://trac.macports.org/attachment/ticket/38588/osdep-darwin.c.diff
 3. Needs some fix for `extract_gpuinfo_apple.m`.

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Ticket URL: <https://trac.macports.org/ticket/71516>
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