aco: Fix build error with std::max on GCC 12

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18969>

src/amd/compiler/aco_util.h

@@ -413,7 +413,7 @@ public:
       /* The size parameter refers to the total size of the buffer.
        * The usable data_size is size - sizeof(Buffer).
        */
-      size = std::max(size, minimum_size);
+      size = MAX2(size, minimum_size);
       buffer = (Buffer*)malloc(size);
       buffer->next = nullptr;
       buffer->data_size = size - sizeof(Buffer);