[newlib-cygwin] Add BSD guards for off_t, dev_t, uid_t, and gid_t

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=de51829c1747c0dd220f720ca84a51a818315b27

commit de51829c1747c0dd220f720ca84a51a818315b27
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Wed Apr 13 13:10:16 2016 +0200

    Add BSD guards for off_t, dev_t, uid_t, and gid_t
    
    Copy definitions of off_t, dev_t, uid_t, and gid_t verbatim from latest
    FreeBSD <sys/types.h>.
    
    Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

Diff:
---
 newlib/libc/include/sys/types.h | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/newlib/libc/include/sys/types.h b/newlib/libc/include/sys/types.h
index c0b5796..496c2ae 100644
--- a/newlib/libc/include/sys/types.h
+++ b/newlib/libc/include/sys/types.h
@@ -168,11 +168,23 @@ typedef int32_t register_t;
  */
 
 #ifndef __CYGWIN__	/* which defines these types in it's own types.h. */
-typedef _off_t	off_t;
-typedef __dev_t dev_t;
-typedef __uid_t uid_t;
-typedef __gid_t gid_t;
+#ifndef _OFF_T_DECLARED
+typedef	__off_t		off_t;		/* file offset */
+#define	_OFF_T_DECLARED
 #endif
+#ifndef _DEV_T_DECLARED
+typedef	__dev_t		dev_t;		/* device number or struct cdev */
+#define	_DEV_T_DECLARED
+#endif
+#ifndef _UID_T_DECLARED
+typedef	__uid_t		uid_t;		/* user id */
+#define	_UID_T_DECLARED
+#endif
+#ifndef _GID_T_DECLARED
+typedef	__gid_t		gid_t;		/* group id */
+#define	_GID_T_DECLARED
+#endif
+#endif /* !__CYGWIN__ */
 
 #ifndef _PID_T_DECLARED
 typedef	__pid_t		pid_t;		/* process id */