patch 9.0.1481: decrypting with libsodium may fail if the library changes

Problem:    Decrypting with libsodium may fail if the library changes.
Solution:   Add parameters used to the encrypted file header. (Christian
            Brabandt, closes #12279)
diff --git a/src/proto/blowfish.pro b/src/proto/blowfish.pro
index 6b2c454..fbaa3dc 100644
--- a/src/proto/blowfish.pro
+++ b/src/proto/blowfish.pro
@@ -1,6 +1,6 @@
 /* blowfish.c */
 void crypt_blowfish_encode(cryptstate_T *state, char_u *from, size_t len, char_u *to, int last);
 void crypt_blowfish_decode(cryptstate_T *state, char_u *from, size_t len, char_u *to, int last);
-int crypt_blowfish_init(cryptstate_T *state, char_u *key, char_u *salt, int salt_len, char_u *seed, int seed_len);
+int crypt_blowfish_init(cryptstate_T *state, char_u *key, crypt_arg_T *arg);
 int blowfish_self_test(void);
 /* vim: set ft=c : */