Removal of deprecated functions

Removal of deprecated X.509 functions

The deprecated function mbedtls_x509write_crt_set_serial() has been removed. The function was superseded by mbedtls_x509write_crt_set_serial_raw().

Removal of deprecated SSL functions

The deprecated function mbedtls_ssl_conf_curves() has been removed. The function was superseded by mbedtls_ssl_conf_groups().

Removal of compat-2.x.h

The header compat-2.x.h, containing some definitions for backward compatibility with Mbed TLS 2.x, has been removed.