gnu: json-modern-cxx: Install json_fwd.hpp header.
* gnu/packages/cpp.scm (json-modern-cxx)[arguments]: Set JSON_MultipleHeaders=ON to install optional header.
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			@ -334,7 +334,8 @@ as ordering relation.")
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    (build-system cmake-build-system)
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    (arguments
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     '(#:configure-flags
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       (list (string-append "-DJSON_TestDataDirectory="
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       (list "-DJSON_MultipleHeaders=ON" ; For json_fwd.hpp.
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             (string-append "-DJSON_TestDataDirectory="
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                            (assoc-ref %build-inputs "json_test_data")))
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       #:phases (modify-phases %standard-phases
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                  ;; XXX: When tests are enabled, the install phase will cause
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