Restore |DES_ede3_cfb_encrypt| and |DES_ede3_cfb64_encrypt| from OpenSSL at ce7e647b.

Change-Id: I7ab7ea3cdabc697b2945a50c8d8f349d6b408848
Reviewed-on: https://boringssl-review.googlesource.com/5211
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/des.h

diff --git a/include/openssl/des.h b/include/openssl/des.h
index 6e1b0cf..aa92c7b 100644
--- a/include/openssl/des.h
+++ b/include/openssl/des.h
@@ -142,6 +142,22 @@
                                          DES_cblock *ivec, int enc);
 
 
+/* Deprecated functions. */
+
+OPENSSL_EXPORT void DES_ede3_cfb64_encrypt(const uint8_t *in, uint8_t *out,
+                                           long length, DES_key_schedule *ks1,
+                                           DES_key_schedule *ks2,
+                                           DES_key_schedule *ks3,
+                                           DES_cblock *ivec, int *num, int enc);
+
+OPENSSL_EXPORT void DES_ede3_cfb_encrypt(const uint8_t *in, uint8_t *out,
+                                         int numbits, long length,
+                                         DES_key_schedule *ks1,
+                                         DES_key_schedule *ks2,
+                                         DES_key_schedule *ks3,
+                                         DES_cblock *ivec, int enc);
+
+
 #if defined(__cplusplus)
 }  /* extern C */
 #endif