Add guard for MBEDTLS_ECP_INTERNAL_ALT
MBEDTLS_ECP_RESTARTABLE and MBEDTLS_ECP_INTERNAL_ALT are mutually
exclusive, can't work and shouldn't be compiled together.
defined(MBEDTLS_ECDSA_SIGN_ALT) || \
defined(MBEDTLS_ECDSA_VERIFY_ALT) || \
defined(MBEDTLS_ECDSA_GENKEY_ALT) || \
+ defined(MBEDTLS_ECP_INTERNAL_ALT) || \
defined(MBEDTLS_ECP_ALT) )
#error "MBEDTLS_ECP_RESTARTABLE defined, but it cannot coexist with an alternative ECP implementation"
#endif
