[MacPorts] #71667: vtk @9.4.1: error: implicit declaration of function 'getentropy' is invalid in C99 [-Werror, -Wimplicit-function-declaration]

[MacPorts]

#71667: vtk @9.4.1: error: implicit declaration of function 'getentropy' is invalid
in C99 [-Werror,-Wimplicit-function-declaration]
-------------------------+--------------------------
  Reporter:  ryandesign  |      Owner:  Dave-Allured
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.5
Resolution:              |   Keywords:
      Port:  vtk         |
-------------------------+--------------------------

Comment (by Dave-Allured):

 Documentation of VTK build controls is sparse and inconsistent.  I think I
 found the correct control to use "external" MacPorts libxml2, instead of
 the bundled copy.  Let's see if [https://github.com/macports/macports-
 ports/pull/27229 this PR] is any good.  I am now waiting for legacy build
 machines to test this.

 @barracuda156 I removed your libxml2 patch for the second time.  I think
 it is no longer relevant because we are now avoiding the down-level,
 bundled copy of libxml2.

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Ticket URL: <https://trac.macports.org/ticket/71667#comment:5>
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