Provide JSONCPP_DEPRECATED definitions for clang and gcc

[Dani-Hub]

Extended definitions of JSONCPP_DEPRECATED

[cdunn2001]

Looks like there was a problem for gcc:

Building CXX object src/lib_json/CMakeFiles/jsoncpp_lib.dir/json_reader.cpp.o
In file included from /home/travis/build/open-source-parsers/jsoncpp/include/json/assertions.h:13:0,
                 from /home/travis/build/open-source-parsers/jsoncpp/src/lib_json/json_reader.cpp:7:
/home/travis/build/open-source-parsers/jsoncpp/include/json/config.h:73:45: error: missing binary operator before token "("

After you fix that, I'll try to test with VisualStudio.

[Dani-Hub]

Could you please provide me the gcc version (major and minor numbers or full version) that you have used for your testing?
[Some what later]: OK, I found that the provided test won't work for gcc versions smaller 5.0. I have now an improved test that works for all gcc versions that are available to me.

[Dani-Hub]

The revised commit has been tested successfully against gcc 4.3.6, 4.4.7, 4.5.4, 4.6.4, 4.7.3, 4.8.1, 4.9.0, 4.9.1, 4.9.2, and HEAD 5.0.0 as well as against clang 3.0, 3.1, 3.2, 3.3, 3.4, 3.5.0, 3.6.0, and HEAD 3.7.0 and finally against Visual Studio 2012

[cdunn2001]

Nice! Thanks.