Fix sys/time.h build problem due to inconsistent macro usage

https://sourceware.org/ml/newlib/2015/msg00520.html describes
	how sys/time.h uses __BSD_VISIBLE while the types used in the
	affected inline functions are guarded with !_POSIX_SOURCE.
	Fix that by guarding the type with __BSD_VISIBLE as well.

        * libc/include/sys/time.h: Explicitely include sys/cdefs.h.
        * libc/include/sys/types.h: Ditto.  Guard BSD convenience base types
        with __BSD_VISIBLE rather than !_POSIX_SOURCE.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

newlib/ChangeLog

@@ -1,3 +1,9 @@
+2015-07-06  Corinna Vinschen  <corinna@vinschen.de>
+
+	* libc/include/sys/time.h: Explicitely include sys/cdefs.h.
+	* libc/include/sys/types.h: Ditto.  Guard BSD convenience base types
+	with __BSD_VISIBLE rather than !_POSIX_SOURCE.
+
 2015-07-01  Sebastian Huber  <sebastian.huber@embedded-brains.de>
 
 	* libc/stdio/fputs.c (_puts_r): Add missing CHECK_INIT().

newlib/libc/include/sys/time.h

@@ -38,6 +38,7 @@
 #define	_SYS_TIME_H_
 
 #include <_ansi.h>
+#include <sys/cdefs.h>
 #include <sys/_timeval.h>
 #include <sys/types.h>
 #include <sys/timespec.h>

newlib/libc/include/sys/types.h

@@ -18,6 +18,7 @@
 #ifndef _SYS_TYPES_H
 
 #include <_ansi.h>
+# include <sys/cdefs.h>
 
 #ifndef __INTTYPES_DEFINED__
 #define __INTTYPES_DEFINED__
@@ -83,7 +84,7 @@ typedef	quad_t *	qaddr_t;
 #define _ST_INT32
 #endif
 
-# ifndef	_POSIX_SOURCE
+# if	__BSD_VISIBLE
 
 #  define	physadr		physadr_t
 #  define	quad		quad_t
@@ -112,7 +113,7 @@ typedef	unsigned long	u_long;
 typedef	unsigned short	ushort;		/* System V compatibility */
 typedef	unsigned int	uint;		/* System V compatibility */
 typedef	unsigned long	ulong;		/* System V compatibility */
-# endif	/*!_POSIX_SOURCE */
+# endif	/*__BSD_VISIBLE */
 
 #ifndef __clock_t_defined
 typedef _CLOCK_T_ clock_t;