threadpool: move typedef into ggml.h

Author: max-krasnyansky

ggml/include/ggml-alloc.h

@@ -9,7 +9,6 @@ extern "C" {
 typedef struct ggml_backend_buffer_type * ggml_backend_buffer_type_t;
 typedef struct      ggml_backend_buffer * ggml_backend_buffer_t;
 typedef struct             ggml_backend * ggml_backend_t;
-typedef struct  ggml_compute_threadpool * ggml_compute_threadpool_t;
 
 // Tensor allocator
 struct ggml_tallocr {

ggml/include/ggml.h

@@ -639,6 +639,8 @@ extern "C" {
 
     struct ggml_compute_threadpool;     // forward declaration, see ggml.c
 
+    typedef struct  ggml_compute_threadpool * ggml_compute_threadpool_t;
+
     // the compute plan that needs to be prepared for ggml_graph_compute()
     // since https://github.com/ggerganov/ggml/issues/287
     struct ggml_cplan {