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This commit introduces the option MBEDTLS_SSL_CONF_SINGLE_EC which can be used to register a single supported elliptic curve at compile time. It replaces the runtime configuration API mbedtls_ssl_conf_curves() which allows to register a _list_ of supported elliptic curves. In contrast to other options used to hardcode configuration options, MBEDTLS_SSL_CONF_SINGLE_EC isn't a numeric option, but instead it's only relevant if it's defined or not. To actually set the single elliptic curve that should be supported, numeric options MBEDTLS_SSL_CONF_SINGLE_EC_TLS_ID MBEDTLS_SSL_CONF_SINGLE_EC_GRP_ID must both be defined and provide the TLS ID and the Mbed TLS internal ID and the chosen curve, respectively.