MBEDTLS_ECDSA_C macro

\def MBEDTLS_ECDSA_C Enable the elliptic curve DSA library. Module: library/ecdsa.c Caller: This module is used by the following key exchanges: ECDHE-ECDSA Requires: MBEDTLS_ECP_C, MBEDTLS_ASN1_WRITE_C, MBEDTLS_ASN1_PARSE_C, and at least one MBEDTLS_ECP_DP_XXX_ENABLED for a short Weierstrass curve.