lmdb: use pwritev() on non-windows systems (MDB_USE_PWRITEV).

Change-Id: Iebd69846fc87cd6bb584002b366837ecb631b603

mdb.c

@@ -33,41 +33,43 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 #ifndef _GNU_SOURCE
-#define _GNU_SOURCE 1
+#	define _GNU_SOURCE 1
 #endif
+
 #ifdef _WIN32
-#include <malloc.h>
-#include <windows.h>
+#	include <malloc.h>
+#	include <windows.h>
 /** getpid() returns int; MinGW defines pid_t but MinGW64 typedefs it
  *  as int64 which is wrong. MSVC doesn't define it at all, so just
  *  don't use it.
  */
-#define MDB_PID_T	int
-#define MDB_THR_T	DWORD
-#include <sys/types.h>
-#include <sys/stat.h>
-#ifdef __GNUC__
-# include <sys/param.h>
+#	define MDB_PID_T	int
+#	define MDB_THR_T	DWORD
+#	include <sys/types.h>
+#	include <sys/stat.h>
+#	ifdef __GNUC__
+#		include <sys/param.h>
+#	else
+#		define LITTLE_ENDIAN	1234
+#		define BIG_ENDIAN	4321
+#		define BYTE_ORDER	LITTLE_ENDIAN
+#		ifndef SSIZE_MAX
+#			define SSIZE_MAX	INT_MAX
+#		endif
+#	endif
 #else
-# define LITTLE_ENDIAN	1234
-# define BIG_ENDIAN	4321
-# define BYTE_ORDER	LITTLE_ENDIAN
-# ifndef SSIZE_MAX
-#  define SSIZE_MAX	INT_MAX
-# endif
-#endif
-#else
-#include <sys/types.h>
-#include <sys/stat.h>
-#define MDB_PID_T	pid_t
-#define MDB_THR_T	pthread_t
-#include <sys/param.h>
-#include <sys/uio.h>
-#include <sys/mman.h>
-#ifdef HAVE_SYS_FILE_H
-#include <sys/file.h>
-#endif
-#include <fcntl.h>
+#	include <sys/types.h>
+#	include <sys/stat.h>
+#	define MDB_PID_T	pid_t
+#	define MDB_THR_T	pthread_t
+#	include <sys/param.h>
+#	include <sys/uio.h>
+#	include <sys/mman.h>
+#	ifdef HAVE_SYS_FILE_H
+#		include <sys/file.h>
+#	endif
+#	include <fcntl.h>
+#	define MDB_USE_PWRITEV
 #endif
 
 /*****************************************************************************