build error

error:
```
lib/crypt-gost-yescrypt.c: In function '_crypt_crypt_gost_yescrypt_rn':
lib/crypt-gost-yescrypt.c:134:16: error: initialization discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
  134 |   char *hptr = strchr ((const char *) intbuf->retval + 3, '$');
      |                ^~~~~~
```
ver: 4.4.38 but same thing on latest version
