repository: delete ignore_env member

This variable was added because the repo_set_gitdir() was created to
cover both submodule and main repos, but these two are initialized a
bit differently so ignore_env == 0 means main repo, while ignore_env
!= 0 is submodules.

Since the difference part (env variables) has been moved out of
repo_set_gitdir(), this function works the same way for both repo
types and ignore_env is not needed anymore.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

repository.c

@@ -140,8 +140,6 @@ static int repo_init(struct repository *repo,
 	struct repository_format format;
 	memset(repo, 0, sizeof(*repo));
 
-	repo->ignore_env = 1;
-
 	if (repo_init_gitdir(repo, gitdir))
 		goto error;
 

repository.h

@@ -75,15 +75,6 @@ struct repository {
 	const struct git_hash_algo *hash_algo;
 
 	/* Configurations */
-	/*
-	 * Bit used during initialization to indicate if repository state (like
-	 * the location of the 'objectdir') should be read from the
-	 * environment.  By default this bit will be set at the begining of
-	 * 'repo_init()' so that all repositories will ignore the environment.
-	 * The exception to this is 'the_repository', which doesn't go through
-	 * the normal 'repo_init()' process.
-	 */
-	unsigned ignore_env:1;
 
 	/* Indicate if a repository has a different 'commondir' from 'gitdir' */
 	unsigned different_commondir:1;