Fix travis build.

Enum values should not be conditioned.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
diff --git a/include/mbedtls/md.h b/include/mbedtls/md.h
index 78f9b40..8f6c2d7 100644
--- a/include/mbedtls/md.h
+++ b/include/mbedtls/md.h
@@ -61,12 +61,10 @@
     MBEDTLS_MD_SHA384,    /**< The SHA-384 message digest. */
     MBEDTLS_MD_SHA512,    /**< The SHA-512 message digest. */
     MBEDTLS_MD_RIPEMD160, /**< The RIPEMD-160 message digest. */
-#if defined(MBEDTLS_SHA3_C)
     MBEDTLS_MD_SHA3_224,    /**< The SHA3-224 message digest. */
     MBEDTLS_MD_SHA3_256,    /**< The SHA3-256 message digest. */
     MBEDTLS_MD_SHA3_384,    /**< The SHA3-384 message digest. */
     MBEDTLS_MD_SHA3_512,    /**< The SHA3-512 message digest. */
-#endif
 } mbedtls_md_type_t;
 
 #if defined(MBEDTLS_SHA512_C) || defined(MBEDTLS_SHA3_C)