fix(cbor): Fix build with picolibc (IEC-512)

[abobija]

Checklist

• Component contains License
• Component contains README.md
• Component contains idf_component.yml file with url field defined
• Component was added to upload job
• Component was added to build job
• Optional: Component contains unit tests
• CI passing

Change description

Build of project that uses espressif/cbor^0.6.1~4 component and picolibc (with idf v6+) fails since picolibc does not have implementation of fopencookie function and cookie_io_functions_t typedef.

By defining __APPLE__ we are switching to picolibc supported funopen alternative that makes project successfully compiled on idf v6+ using picolibc. Note that CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY still needs to be enabled to compile with picolibc, even if we switch to __APPLE__.

It would be nice if cbor component could work without defining CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY and rely completely on picolibc without any hacks.

I've opened a PR in origin tinycbor's repo as well to support picolibc, so maybe we will accomplish something:
intel/tinycbor#319

Maybe to wait if intel's tinycbor is going to support picolibc...

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}