patchenvironment.h: remove unused variables

> packed_git_window_size and packed_git_limit are not used anywhere in
> the codebase. A search found that all references were removed in
> d284713bae (config: make `packed_git_(limit|window_size)` non-global
> variables, 2024-12-03), except the ones in this file, as they were moved
> to struct repo_settings.
> 
> Remove packed_git_window_size and packed_git_limit from environment.h.
> 
> Signed-off-by: Arnav Bhate <bhatearnav@gmail.com>
> ---
>  environment.h | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/environment.h b/environment.h
> index 45e690f203..cf6fc04e70 100644
> --- a/environment.h
> +++ b/environment.h
> @@ -152,8 +152,6 @@ extern char *apply_default_ignorewhitespace;
>  extern char *git_attributes_file;
>  extern int zlib_compression_level;
>  extern int pack_compression_level;
> -extern size_t packed_git_window_size;
> -extern size_t packed_git_limit;
>  extern unsigned long big_file_threshold;
>  extern unsigned long pack_size_limit_cfg;
>  extern int max_allowed_tree_depth;