CI: force use more fresh compiler for native on OSX

[puzrin]

Problem:

• native (emulator) build uses default OS's gcc compiler
• gcc in OSX is VERY old (they prefer llvm)

As a result, when you try to use some modern libs like ETL, build will fail. See https://github.com/puzrin/dispenser/blob/master/.github/workflows/ci.yml#L52-L54

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I consider this as bug of PIO, but problem still exists.

[andrew-elsayeh]

Yes, this is a good point!

There is no gcc port for the Apple Silicone Macs (M1, M1 Pro and M1 Max)

[puzrin]

Do PR, if you know how to fix https://github.com/lvgl/lv_platformio/blob/master/.github/workflows/ci.yml#L56-L76

[bobwolff68]

After lots of gyrations, I did manage to compile and execute this project on a Mac M1. The change was simple. Add a few items to build_flags in platformio.ini
-arch arm64
-I /opt/homebrew/include
-L /opt/homebrew/lib