[MacPorts] #45928: cvc4 @1.4 Adding Java variant - updated Portfile

[MacPorts]

#45928: cvc4 @1.4 Adding Java variant - updated Portfile
----------------------------+--------------------------------
 Reporter:  corwin.amber@…  |      Owner:  macports-tickets@…
     Type:  enhancement     |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.3.2
 Keywords:  java            |       Port:  cvc4
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 Since CVC4 offers a Java library, which is not build by default but
 requires ./configure --enable-language-bindings=java, I added a variant
 (+java) so the user can request the jarfile and JNI code to be built. This
 requires an installation of a JDK in /System/Library/Frameworks.

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Ticket URL: <https://trac.macports.org/ticket/45928>
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