Windows build fails when using json-c 0.17

[jfx2006]

Description

Building using json-c 0.17 using clang-cl w/ MSVC libraries fails with:

C:\src\install\include\json-c\json_inttypes.h(34,17): error C2628: 'SSIZE_T' followed by '__int64' is illegal (did you forget a ';'?) [C:\src\rnp-v0.17.0\rnp-v0.17.0\build\src\lib\librnp-obj.vcxproj]

Steps to Reproduce

1. Build/install json-c 0.17 with cmake
2. Set up RNP v0.17 to build with vcpkg for other dependencies (downgrade botan to 2.19.2)
3. Run cmake to configure (msvc), & build

Expected Behavior

Successful build

Actual Behavior

Build fails with above error.
Further info when building with Thunderbird's build setup:

In file included from /builds/worker/checkouts/gecko/comm/third_party/rnp/src/rnp/fficli.cpp:59:
In file included from /builds/worker/checkouts/gecko/comm/third_party/rnp/src/rnp/fficli.h:37:
In file included from /builds/worker/workspace/obj-build/comm/third_party/json-c/json.h:27:
In file included from /builds/worker/checkouts/gecko/comm/third_party/json-c/json_object.h:26:
    /builds/worker/checkouts/gecko/comm/third_party/json-c/json_inttypes.h(34,17): error: 'long long type-name' is invalid
   34 | typedef SSIZE_T ssize_t;
        |                 ^
 /builds/worker/checkouts/gecko/comm/third_party/rnp/src/common/uniwin.h(38,17): note: expanded from macro 'ssize_t'
 #define ssize_t __int64
                 ^

uniwin.h's #define conflicts with json-c's (new in 0.17) typedef.

[ni4]

Thanks for reporting! @antonsviridenko would you have a time to look into it?