environment.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
d284713 (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>
Acked-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: arnavbhate

environment.h

@@ -163,8 +163,6 @@ extern char *git_attributes_file;
 extern char *git_hooks_path;
 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;