[Bug 226401] devel/jsoncpp scons build system claimed obsolete. moreover, won't build if system default python is 3.*

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226401

            Bug ID: 226401
           Summary: devel/jsoncpp scons build system claimed obsolete.
                    moreover, won't build if system default python is 3.*
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: yuri at freebsd.org
          Reporter: dan at obluda.cz
          Assignee: yuri at freebsd.org
             Flags: maintainer-feedback?(yuri at freebsd.org)

Created attachment 191258
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=191258&action=edit
scons->cmake patch for  head/devel/jsoncpp/Makefile 462353 2018-02-19 22:25:14Z
yuri

== Issue ==

1. From README.md: "The SCons-based build system is deprecated. Please use
CMake"

2. From SConstruct: "shared library support is buggy: it assumes that a static
and dynamic library can be build from the same object files. This is not true
on many platforms"

3. With python 3.* claimed system default it doesn't build because of several
syntax errors in SConstruct and undefined functions called

 == Solution (all three issues) ==

Follow README.md and use CMake instead of scons. It require simple change in
Makefile only, see attachment. Moreover, devel/jsoncpp/files/patch-SConstruct
and devel/jsoncpp/files/patch-src_lib__json_sconscript become obsolete and can
be removed.

Brief summary of Makefile changes:

1: scons replaced by cmake:noninja in USES
2: scons related args PLATFORM and MAKE_ARGS replaced by CMAKE_ARGS
3: paths in "do_install" modified to follow CMAKE flavor of build tree
4: "do-test" modified to follow CMAKE flavor of test

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