Add loader stub for GGJT

Author: iacore

ggml/src/lib.rs

@@ -16,8 +16,10 @@ use std::{
 
 pub use ggml_sys::ggml_type as Type;
 
-/// Magic constant for `ggml` files (versioned).
-pub const FILE_MAGIC: u32 = 0x67676d66;
+/// Magic constant for `ggml` files (versioned, ggmf).
+pub const FILE_MAGIC_GGMF: u32 = 0x67676d66;
+/// Magic constant for `ggml` files (versioned, ggjt).
+pub const FILE_MAGIC_GGJT: u32 = 0x67676a74;
 /// Magic constant for `ggml` files (unversioned).
 pub const FILE_MAGIC_UNVERSIONED: u32 = 0x67676d6c;