Merge branch 'rs/drop-core-compression-vars' into maint

Code clean-up.

* rs/drop-core-compression-vars:
  compression: drop write-only core_compression_* variables

cache.h

@@ -958,7 +958,6 @@ extern char *apply_default_ignorewhitespace;
 extern const char *git_attributes_file;
 extern const char *git_hooks_path;
 extern int zlib_compression_level;
-extern int core_compression_level;
 extern int pack_compression_level;
 extern size_t packed_git_window_size;
 extern size_t packed_git_limit;

config.c

@@ -76,7 +76,6 @@ static struct key_value_info *current_config_kvi;
  */
 static enum config_scope current_parsing_scope;
 
-static int core_compression_seen;
 static int pack_compression_seen;
 static int zlib_compression_seen;
 
@@ -1400,8 +1399,6 @@ static int git_default_core_config(const char *var, const char *value, void *cb)
 			level = Z_DEFAULT_COMPRESSION;
 		else if (level < 0 || level > Z_BEST_COMPRESSION)
 			die(_("bad zlib compression level %d"), level);
-		core_compression_level = level;
-		core_compression_seen = 1;
 		if (!zlib_compression_seen)
 			zlib_compression_level = level;
 		if (!pack_compression_seen)

environment.c

@@ -41,7 +41,6 @@ char *apply_default_ignorewhitespace;
 const char *git_attributes_file;
 const char *git_hooks_path;
 int zlib_compression_level = Z_BEST_SPEED;
-int core_compression_level;
 int pack_compression_level = Z_DEFAULT_COMPRESSION;
 int fsync_object_files;
 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;