vulkan-loader: include "loader_json.h"instead of "cJSON.h"

[charles-lunarg]

@DavidKorczynski Fix of the build - in the update to cJSON I moved the loader specific functions to loader_json.h/.c which breaks one of the original fuzzers. This updates that fuzzer to include what should be the correct file.

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charles-lunarg is either the primary contact or is in the CCs list of projects/vulkan-loader.
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[DavidKorczynski]

Thanks @charles-lunarg -- I think this is the fix we need: #12800

I tested your suggestion locally but we're running into the same issue as shown in https://oss-fuzz-build-logs.storage.googleapis.com/log-e8c38e7d-531c-4b0f-b7ce-40037aae4c9a.txt

[DavidKorczynski]

It's building again now: https://oss-fuzz-build-logs.storage.googleapis.com/index.html#vulkan-loader

Fix from #12800 solved it.

[charles-lunarg]

Yep, I was just trying to get the ball rolling (and didnt actually try to build oss-fuzz). Appreciate you coming in and fixing the real problem.