[BUG] [C] Generating C client undefined `object.h` in

Bug Report Checklist

ll/minimal spec to reproduce the issue?

• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (editor.swagger)

Description

I am trying to compile the library generated using openapi-generator with the past command, because this is what i need for my project, not use directly the files.
I try with other specs and i don't have any problem, is just with mine, and is only in C, because i try library generated in CSharp and Python and work very well.

openapi-generator version

@openapitools/openapi-generator-cli@cli-3.3.4

OpenAPI declaration file content or url

You can find the yml we create in the next address:
https://gist.github.com/stdevMac/2df88707fbbe652424cc35e043be828b

Command line used for generation

$ openapi-generator generate -g c --additional-properties=prependFormOrBodyParameters=true -o ./c_swagger -i ./swagger.yml

Steps to reproduce

Just run this after follow all the steps in generated README.md

$ gcc $(find . -name '*.c')  -I ./model -I ./include -I ./external/include -o p.out -lcurl 
In file included from ./api/DefaultAPI.c:15:0:
./model/inline_response_200_7.h:13:10: fatal error: object.h: No such file or directory
 #include "object.h"
          ^~~~~~~~~~
compilation terminated.
In file included from ./model/inline_response_200_7.c:7:0:
./model/inline_response_200_7.h:13:10: fatal error: object.h: No such file or directory
 #include "object.h"
          ^~~~~~~~~~
compilation terminated.

Generate the C client from the linked swagger.yml with the stated openapi-generator command, then follow the generated README.md and compile the files under api, model, include, and external/include. Start with model/inline_response_200_7.h and its corresponding .c file; done means the generated client no longer fails because object.h is missing.