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Add ability to build with system installed jsoncpp #1178

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Add ability to build with system installed jsoncpp #1178

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Commits on Aug 15, 2019

  1. cmake: Add option to build with system jsoncpp. 

    This patch adds the CMake build option `USE_SYSTEM_JSONCPP`,
which instead of using the internal `jsoncpp.cpp` links against
the system installed jsoncpp library.

This results in a `libopenvr_api.so` that is only 115K instead of 301K
on my system.

Distributions like Debian will prefer this behaviour, since it will give
them the possibility to maintain version and security issues for jsoncpp
in one place.

This behaviour can be enabled by

```
cmake -DUSE_SYSTEM_JSONCPP=True .
```

When the flag is not set, the build will behave like it did before.

I tested this patch using the system wide jsoncpp successfully
with xrdesktop.
    @lubosz
    lubosz committed Aug 15, 2019
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  2. thirdparty: Move jsoncpp to thridparty directory. 

    Even though the previous patch in this patch set enabled the build with
a system wide jsoncpp and worked for me, it still left the internal
jsoncpp includes in the include path, since the includes were placed
in `CMAKE_CURRENT_SOURCE_DIR`. This could cause problems on other systems
when trying to build with a system wide jsoncpp.

In order to remove the internal json.h from the include path,
I moved all jsoncpp files into a thridparty directory amd include
it in the case of `USE_SYSTEM_JSONCPP` not being set.
    @lubosz
    lubosz committed Aug 15, 2019
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