Bump required minimum version of cryptsetup to 2.4.0

Major distributions already have cryptsetup newer than 2.4.0.
Let's bump the minimal required version.

Note, cryptsetup 2.4.0 was released on 2021-08-18.

See also #38608.

src/shared/cryptsetup-util.h

@@ -7,14 +7,6 @@
 #if HAVE_LIBCRYPTSETUP
 #include <libcryptsetup.h> /* IWYU pragma: export */
 
-/* These next two are defined in libcryptsetup.h from cryptsetup version 2.3.4 forwards. */
-#ifndef CRYPT_ACTIVATE_NO_READ_WORKQUEUE
-#define CRYPT_ACTIVATE_NO_READ_WORKQUEUE (1 << 24)
-#endif
-#ifndef CRYPT_ACTIVATE_NO_WRITE_WORKQUEUE
-#define CRYPT_ACTIVATE_NO_WRITE_WORKQUEUE (1 << 25)
-#endif
-
 extern DLSYM_PROTOTYPE(crypt_activate_by_passphrase);
 extern DLSYM_PROTOTYPE(crypt_activate_by_signed_key);
 extern DLSYM_PROTOTYPE(crypt_activate_by_volume_key);
@@ -39,11 +31,7 @@ extern DLSYM_PROTOTYPE(crypt_keyslot_max);
 extern DLSYM_PROTOTYPE(crypt_load);
 extern DLSYM_PROTOTYPE(crypt_metadata_locking);
 extern DLSYM_PROTOTYPE(crypt_reencrypt_init_by_passphrase);
-#if HAVE_CRYPT_REENCRYPT_RUN
 extern DLSYM_PROTOTYPE(crypt_reencrypt_run);
-#else
-extern DLSYM_PROTOTYPE(crypt_reencrypt);
-#endif
 extern DLSYM_PROTOTYPE(crypt_resize);
 extern DLSYM_PROTOTYPE(crypt_resume_by_volume_key);
 extern DLSYM_PROTOTYPE(crypt_set_data_device);
@@ -55,13 +43,7 @@ extern DLSYM_PROTOTYPE(crypt_set_pbkdf_type);
 extern DLSYM_PROTOTYPE(crypt_suspend);
 extern DLSYM_PROTOTYPE(crypt_token_json_get);
 extern DLSYM_PROTOTYPE(crypt_token_json_set);
-#if HAVE_CRYPT_TOKEN_MAX
 extern DLSYM_PROTOTYPE(crypt_token_max);
-#else
-/* As a fallback, use the same hard-coded value libcryptsetup uses internally. */
-int crypt_token_max(_unused_ const char *type);
-#define sym_crypt_token_max(type) crypt_token_max(type)
-#endif
 #if HAVE_CRYPT_TOKEN_SET_EXTERNAL_PATH
 extern DLSYM_PROTOTYPE(crypt_token_set_external_path);
 #endif