openjdk: remove need for fdescfs(5) and probably procfs(5)HEADmain

Implement getCommittedVirtualMemorySize() directly using sysctl
kern.proc.vmmap
Implement getOpenFileDescriptorCount() directly using sysctl
kern.proc.nfds

Note on openjdk17 use closefrom where possible (note this use case is
only in openjdk 17, 21, 23 and 24)

Remove the message about the use of fdescfs(5) as this is not needed
for sure, keep the information about procfs(5) as I have not analysed
enough the source code to make sure it is not used anywhere else, but
I don't think it is.

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