[MacPorts] #66425: libdeflate @1.15 does not build on < 10.13, unconditional use of futimens

[MacPorts]

#66425: libdeflate @1.15 does not build on < 10.13, unconditional use of futimens
-------------------------+-------------------------
  Reporter:  ballapete   |      Owner:  herbygillot
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.0
Resolution:              |   Keywords:
      Port:  libdeflate  |
-------------------------+-------------------------

Comment (by ballapete):

 In another log file I saw these lines that are missing here:

 {{{
 MACPORTS_LEGACY_SUPPORT_CPPFLAGS='-isystem/opt/local/include/LegacySupport'
 MACPORTS_LEGACY_SUPPORT_ENABLED='1'
 MACPORTS_LEGACY_SUPPORT_LDFLAGS='-L/opt/local/lib -lMacportsLegacySupport'
 }}}

 which are probably introduced by this line in `Portfile`:

 {{{
 PortGroup               legacysupport 1.1
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66425#comment:4>
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