[MacPorts] #51203: jsoncpp @1.7.2: build fails when ccache is installed

[MacPorts]

#51203: jsoncpp @1.7.2: build fails when ccache is installed
--------------------------+-----------------------
 Reporter:  ryandesign@…  |      Owner:  felipou@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  jsoncpp
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 jsoncpp fails to build when ccache is installed, because the jsoncpp build
 system detects the presence of ccache and tries to use it. This patch
 prevents the build system from doing that.

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Ticket URL: <https://trac.macports.org/ticket/51203>
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