[newlib-cygwin] Fix <sys/_types.h> issues with <stddef.h>

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=f5a5a23ea8c73f9d2a2fdcb471883989f23f9e4b

commit f5a5a23ea8c73f9d2a2fdcb471883989f23f9e4b
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Thu May 16 14:40:34 2019 +0200

    Fix <sys/_types.h> issues with <stddef.h>
    
    A commit from 2016 tried to address this GCC provided <stddef.h> issue
    
        #if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \
          || defined(__DragonFly__) \
          || defined(__FreeBSD_kernel__)
        /* __size_t is a typedef on FreeBSD 5, must not trash it. */
        #elif defined (__VMS__)
        /* __size_t is also a typedef on VMS.  */
        #else
        #define __size_t
        #endif
    
    with an include of <stddef.h> before <sys/_types.h> in <sys/types.h>.
    Is is not robust enough.  Do the include of <stddef.h> in <sys/_types.h>
    directly and request only the necessary types.
    
    Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

Diff:
---
 newlib/libc/include/sys/_types.h | 6 +++---
 newlib/libc/include/sys/types.h  | 2 --
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/newlib/libc/include/sys/_types.h b/newlib/libc/include/sys/_types.h
index 0ed56ed..017a0aa 100644
--- a/newlib/libc/include/sys/_types.h
+++ b/newlib/libc/include/sys/_types.h
@@ -19,6 +19,9 @@
 #ifndef	_SYS__TYPES_H
 #define _SYS__TYPES_H
 
+#define __need_size_t
+#define __need_wint_t
+#include <stddef.h>
 #include <newlib.h>
 #include <sys/config.h>
 #include <machine/_types.h>
@@ -154,9 +157,6 @@ typedef long _ssize_t;
 
 typedef _ssize_t __ssize_t;
 
-#define __need_wint_t
-#include <stddef.h>
-
 #ifndef __machine_mbstate_t_defined
 /* Conversion state information.  */
 typedef struct
diff --git a/newlib/libc/include/sys/types.h b/newlib/libc/include/sys/types.h
index 19e3de6..4613ac8 100644
--- a/newlib/libc/include/sys/types.h
+++ b/newlib/libc/include/sys/types.h
@@ -42,8 +42,6 @@ typedef __intptr_t register_t;
 #ifndef __need_inttypes
 
 #define _SYS_TYPES_H
-/* <stddef.h> must be before <sys/_types.h> for __size_t considerations */
-#include <stddef.h>
 #include <sys/_types.h>
 #include <sys/_stdint.h>