Hotfix for compile issue #659

[SloCompTech]

Fix for compile issue when compile there were error in config.h and value.h in pre-processing code, details in issue #659.

[SloCompTech]

I also fixed instructions for install where parameters were switched

[cdunn2001]

• The README fix is good.
• The C++11 setting is fine. I'm not sure it's needed, but we don't want to support non-C++11 anyway.
• I'm not sure about the JSONCPP_USING_SECURE_MEMORY change. Someone might be relying on 0 as false. Note that version.h sets that to 0 if it was not defined, which is the proper logic.

Maybe there is a different problem with the Meson build, where version.h is somehow dropped?

[SloCompTech]

Fixed readme, temporary fixed compile bug with adding jsoncpp_cdata.set('JSONCPP_USE_SECURE_MEMORY',0) in meson build config, that means that use of secure memory is disabled, but if you compile any program with -ljsoncpp it works, but if you enable USE_SECURE_MEMORY, then you get error on asString() method (when I compile my program)

ConfigModule.cpp:252:54: error: conversion from ‘std::__cxx11::basic_string<char, std::char_traits<char>, Json::SecureAllocator<char> >’ to non-scalar type ‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ requested
           std::string text = entry[OPT_TYPE].asString();

This is defenetly compile issue.

[cdunn2001]

For our future reference:

• http:https://mesonbuild.com/Configuration.html
• http:https://mesonbuild.com/Reference-manual.html