fix: convert TENSOR_ALIGNMENT to a macro

Author: giladgd

ggml/src/ggml-backend.cpp

@@ -682,8 +682,6 @@ ggml_backend_t ggml_backend_init_best(void) {
 
 // backend CPU
 
-static const size_t TENSOR_ALIGNMENT = 32; // required for mmap as gguf only guarantees 32-byte alignment
-
 static const char * ggml_backend_cpu_buffer_get_name(ggml_backend_buffer_t buffer) {
     return "CPU";
 

ggml/src/ggml-impl.h

@@ -19,6 +19,9 @@ extern "C" {
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 
+// required for mmap as gguf only guarantees 32-byte alignment
+#define TENSOR_ALIGNMENT 32
+
 // static_assert should be a #define, but if it's not,
 // fall back to the _Static_assert C11 keyword.
 // if C99 - static_assert is noop