Wrong version of CMAKE specified

[EddieTheHead]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [x ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

1. Install CMAKE 3.13
2. Try to build project

Any log messages given by the failure

CMake Error at components/azure-iot-middleware-freertos/CMakeLists.txt:27 (file): file does not recognize sub-command REAL_PATH

Expected/desired behavior

Program builds

OS and Version?

Linux

Versions

Mention any other details that might be useful

CMAKE file specifies minimal version as cmake_minimum_required(VERSION 3.13) but uses api introduced in CMAKE version 3.19

file(REAL_PATH <path> <out-var> [BASE_DIRECTORY <dir>] [EXPAND_TILDE])[¶](https://cmake.org/cmake/help/latest/command/file.html#real-path)

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Thanks! We'll be in touch soon.

[ericwolz]

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