Restore MD5-SHA1 in legacy method database

If we remove these, the functions EVP_get_digestbyname() and
EVP_get_cipherbyname() will stop working entirely, and it's too early
to criple them yet.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10176)

crypto/evp/c_alld.c

@@ -22,6 +22,7 @@ void openssl_add_all_digests_int(void)
 #ifndef OPENSSL_NO_MD5
     EVP_add_digest(EVP_md5());
     EVP_add_digest_alias(SN_md5, "ssl3-md5");
+    EVP_add_digest(EVP_md5_sha1());
 #endif
     EVP_add_digest(EVP_sha1());
     EVP_add_digest_alias(SN_sha1, "ssl3-sha1");