Fix typo in configuration

Change duplicate of MBEDTLS_ECDH_GEN_PUBLIC_ALT to
MBEDTLS_ECDH_COMPUTE_SHARED_ALT
diff --git a/library/version_features.c b/library/version_features.c
index 802832c..d7acae3 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -165,9 +165,9 @@
 #if defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT)
     "MBEDTLS_ECDH_GEN_PUBLIC_ALT",
 #endif /* MBEDTLS_ECDH_GEN_PUBLIC_ALT */
-#if defined(MBEDTLS_ECDH_GEN_PUBLIC_ALT)
-    "MBEDTLS_ECDH_GEN_PUBLIC_ALT",
-#endif /* MBEDTLS_ECDH_GEN_PUBLIC_ALT */
+#if defined(MBEDTLS_ECDH_COMPUTE_SHARED_ALT)
+    "MBEDTLS_ECDH_COMPUTE_SHARED_ALT",
+#endif /* MBEDTLS_ECDH_COMPUTE_SHARED_ALT */
 #if defined(MBEDTLS_ECP_INTERNAL_ALT)
     "MBEDTLS_ECP_INTERNAL_ALT",
 #endif /* MBEDTLS_ECP_INTERNAL_ALT */