reftable: introduce "reftable-system.h" header

We're including a couple of standard headers like <stdint.h> in a bunch
of locations, which makes it hard for a project to plug in their own
logic for making required functionality available. For us this is for
example via "compat/posix.h", which already includes all of the system
headers relevant to us.

Introduce a new "reftable-system.h" header that allows projects to
provide their own headers.

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

Author: pks-t

reftable/reftable-basics.h

@@ -9,7 +9,7 @@
 #ifndef REFTABLE_BASICS_H
 #define REFTABLE_BASICS_H
 
-#include <stddef.h>
+#include "reftable-system.h"
 
 /* A buffer that contains arbitrary byte slices. */
 struct reftable_buf {

reftable/reftable-block.h

@@ -9,8 +9,7 @@
 #ifndef REFTABLE_BLOCK_H
 #define REFTABLE_BLOCK_H
 
-#include <stdint.h>
-
+#include "reftable-system.h"
 #include "reftable-basics.h"
 #include "reftable-blocksource.h"
 #include "reftable-iterator.h"

reftable/reftable-blocksource.h

@@ -9,7 +9,7 @@
 #ifndef REFTABLE_BLOCKSOURCE_H
 #define REFTABLE_BLOCKSOURCE_H
 
-#include <stdint.h>
+#include "reftable-system.h"
 
 /*
  * Generic wrapper for a seekable readable file.

reftable/reftable-error.h

@@ -9,6 +9,8 @@
 #ifndef REFTABLE_ERROR_H
 #define REFTABLE_ERROR_H
 
+#include "reftable-system.h"
+
 /*
  * Errors in reftable calls are signaled with negative integer return values. 0
  * means success.

reftable/reftable-fsck.h

@@ -1,6 +1,7 @@
 #ifndef REFTABLE_FSCK_H
 #define REFTABLE_FSCK_H
 
+#include "reftable-system.h"
 #include "reftable-stack.h"
 
 enum reftable_fsck_error {

reftable/reftable-iterator.h

@@ -9,6 +9,7 @@
 #ifndef REFTABLE_ITERATOR_H
 #define REFTABLE_ITERATOR_H
 
+#include "reftable-system.h"
 #include "reftable-record.h"
 
 struct reftable_iterator_vtable;

reftable/reftable-merged.h

@@ -9,6 +9,7 @@
 #ifndef REFTABLE_MERGED_H
 #define REFTABLE_MERGED_H
 
+#include "reftable-system.h"
 #include "reftable-iterator.h"
 
 /*

reftable/reftable-record.h

@@ -9,8 +9,8 @@
 #ifndef REFTABLE_RECORD_H
 #define REFTABLE_RECORD_H
 
+#include "reftable-system.h"
 #include "reftable-basics.h"
-#include <stdint.h>
 
 /*
  * Basic data types

reftable/reftable-stack.h

@@ -9,6 +9,7 @@
 #ifndef REFTABLE_STACK_H
 #define REFTABLE_STACK_H
 
+#include "reftable-system.h"
 #include "reftable-writer.h"
 
 /*

reftable/reftable-system.h

@@ -0,0 +1,7 @@
+#ifndef REFTABLE_SYSTEM_H
+#define REFTABLE_SYSTEM_H
+
+#define MINGW_DONT_HANDLE_IN_USE_ERROR
+#include "compat/posix.h"
+
+#endif