Restore polarSSL

[bucanero]

No description provided.

[tpimh]

What is the reason for restoring this package? From Wikipedia article:

As of the release of version 1.3.10, PolarSSL has been rebranded to Mbed TLS to better show its fit inside the Mbed ecosystem.

Starting from version 2.1.0, the library was made available under both the GPL v2 and Apache License v2.0.

In 2020, Mbed TLS joined the TrustedFirmware project.

I guess, it won't hurt to have multiple versions of the same library if someone needs them.

[bucanero]

Already discussed on discord. The API is different, if your code uses polar, you need to migrate everything to the new API. It's useful for compatibility with older apps.

[sharkwouter]

As @bucanero said, PolarSSL is not backwards compatible

[tpimh]

Makes sense then. I thought it's just a matter of couple of defines to reflect the name change. But if it's more than this, let's just have multiple versions.