Merge branch 'ab/config-based-hooks-2'

More "config-based hooks".

* ab/config-based-hooks-2:
  run-command: remove old run_hook_{le,ve}() hook API
  receive-pack: convert push-to-checkout hook to hook.h
  read-cache: convert post-index-change to use hook.h
  commit: convert {pre-commit,prepare-commit-msg} hook to hook.h
  git-p4: use 'git hook' to run hooks
  send-email: use 'git hook run' for 'sendemail-validate'
  git hook run: add an --ignore-missing flag
  hooks: convert worktree 'post-checkout' hook to hook library
  hooks: convert non-worktree 'post-checkout' hook to hook library
  merge: convert post-merge to use hook.h
  am: convert applypatch-msg to use hook.h
  rebase: convert pre-rebase to use hook.h
  hook API: add a run_hooks_l() wrapper
  am: convert {pre,post}-applypatch to use hook.h
  gc: use hook library for pre-auto-gc hook
  hook API: add a run_hooks() wrapper
  hook: add 'run' subcommand

run-command.c

@@ -1307,39 +1307,6 @@ int async_with_fork(void)
 #endif
 }
 
-int run_hook_ve(const char *const *env, const char *name, va_list args)
-{
-	struct child_process hook = CHILD_PROCESS_INIT;
-	const char *p;
-
-	p = find_hook(name);
-	if (!p)
-		return 0;
-
-	strvec_push(&hook.args, p);
-	while ((p = va_arg(args, const char *)))
-		strvec_push(&hook.args, p);
-	if (env)
-		strvec_pushv(&hook.env_array, (const char **)env);
-	hook.no_stdin = 1;
-	hook.stdout_to_stderr = 1;
-	hook.trace2_hook_name = name;
-
-	return run_command(&hook);
-}
-
-int run_hook_le(const char *const *env, const char *name, ...)
-{
-	va_list args;
-	int ret;
-
-	va_start(args, name);
-	ret = run_hook_ve(env, name, args);
-	va_end(args);
-
-	return ret;
-}
-
 struct io_pump {
 	/* initialized by caller */
 	int fd;