A port of Mbed-TLS for the Classic Macintosh OS 7/8/9

I was previously maintaining an mbedTLS fork for classic/Carbon Mac OS (https://github.com/bslabs/mbedtls) for use with libssh2, they were still keeping C89 compatibility at the time which was helpful.

Newer versions of CodeWarrior do support C99, but I can't remember if Pro 6 (the last version with a 68k toolchain) does. My go-to was Pro 8, since it's Carbonized you can run it natively on OS X (PPC or under Rosetta 1). It's possible to take the Pro 6 68k tools and use them in Pro 8 as well: https://github.com/macssh/macssh/wiki/Using-CWPro6's-68k-too...