[MacPorts] #56648: blosc: Don't use bundled libraries

[MacPorts]

#56648: blosc: Don't use bundled libraries
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  stromnov
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  blosc
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 blosc fails to build on older systems, due to a problem building the
 bundled copy of zstd.

 Could blosc use the MacPorts copy of zstd instead of building it itself?
 The MacPorts copy of zstd builds fine on older systems (once
 [https://github.com/macports/macports-ports/pull/1997 PR 1997] is merged).

 blosc includes other bundled libraries as well, to which the same request
 applies.

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Ticket URL: <https://trac.macports.org/ticket/56648>
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