add better support for IWYU and fix things

Remove the "make iwyu" build target. Move the functionality into the
recently introduced lint.fish script. Fix a lot, but not all, of the
include-what-you-use errors. Specifically, it fixes all of the IWYU errors
on my OS X server but only removes some of them on my Ubuntu 14.04 server.

Fixes #2957

1 files changed, 2 insertions, 6 deletions

diff --git a/src/io.cpp b/src/io.cpp
index 61452830..ed5afe55 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -1,23 +1,19 @@
 /** \file io.c
 
 Utilities for io redirection.
-
 */
-#include "config.h" // IWYU pragma: keep
-
-
 #include <stdio.h>
 #include <errno.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stddef.h>
 
 #include "fallback.h" // IWYU pragma: keep
-#include "wutil.h"
+#include "wutil.h"  // IWYU pragma: keep
 #include "exec.h"
 #include "common.h"
 #include "io.h"
 
-
 io_data_t::~io_data_t()
 {
 }