Fix compilation if OpenSSL was configured with "no-rc4"

[Tobias Ulmer]

Fix compilation if OpenSSL was configured with "no-rc4" option.

diff --git a/cipher.c b/cipher.c
index 13847e5..00db675 100644
--- a/cipher.c
+++ b/cipher.c
@@ -90,9 +90,11 @@ static const struct sshcipher ciphers[] = {
 			SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_bf_cbc },
 	{ "cast128-cbc",
 			SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 1, EVP_cast5_cbc },
+#ifndef OPENSSL_NO_RC4
 	{ "arcfour",	SSH_CIPHER_SSH2, 8, 16, 0, 0, 0, 0, EVP_rc4 },
 	{ "arcfour128",	SSH_CIPHER_SSH2, 8, 16, 0, 0, 1536, 0, EVP_rc4 },
 	{ "arcfour256",	SSH_CIPHER_SSH2, 8, 32, 0, 0, 1536, 0, EVP_rc4 },
+#endif
 	{ "aes128-cbc",	SSH_CIPHER_SSH2, 16, 16, 0, 0, 0, 1, EVP_aes_128_cbc },
 	{ "aes192-cbc",	SSH_CIPHER_SSH2, 16, 24, 0, 0, 0, 1, EVP_aes_192_cbc },
 	{ "aes256-cbc",	SSH_CIPHER_SSH2, 16, 32, 0, 0, 0, 1, EVP_aes_256_cbc },
@@ -617,7 +619,7 @@ cipher_set_keyiv(struct sshcipher_ctx *cc, const u_char *iv)
 	return 0;
 }
 
-#ifdef WITH_OPENSSL
+#if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_RC4)
 #define EVP_X_STATE(evp)	(evp).cipher_data
 #define EVP_X_STATE_LEN(evp)	(evp).cipher->ctx_size
 #endif
@@ -625,7 +627,7 @@ cipher_set_keyiv(struct sshcipher_ctx *cc, const u_char *iv)
 int
 cipher_get_keycontext(const struct sshcipher_ctx *cc, u_char *dat)
 {
-#ifdef WITH_OPENSSL
+#if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_RC4)
 	const struct sshcipher *c = cc->cipher;
 	int plen = 0;
 
@@ -644,7 +646,7 @@ cipher_get_keycontext(const struct sshcipher_ctx *cc, u_char *dat)
 void
 cipher_set_keycontext(struct sshcipher_ctx *cc, const u_char *dat)
 {
-#ifdef WITH_OPENSSL
+#if defined(WITH_OPENSSL) && !defined(OPENSSL_NO_RC4)
 	const struct sshcipher *c = cc->cipher;
 	int plen;