Fix pg_basebackup output to stdout on Windows.

When writing a backup to stdout with pg_basebackup on Windows, put stdout
to binary mode. Any CR bytes in the output will otherwise be output
incorrectly as CR+LF.

In the passing, standardize on using "_setmode" instead of "setmode", for
the sake of consistency. They both do the same thing, but according to
MSDN documentation, setmode is deprecated.

Fixes bug #14634, reported by Henry Boehlert. Patch by Haribabu Kommi.
Backpatch to all supported versions.

Discussion: https://www.postgresql.org/message-id/20170428082818.24366.13134@wrigleys.postgresql.org

src/bin/pg_basebackup/pg_basebackup.c

@@ -954,6 +954,10 @@ ReceiveTarFile(PGconn *conn, PGresult *res, int rownum)
 		 */
 		if (strcmp(basedir, "-") == 0)
 		{
+#ifdef WIN32
+			_setmode(fileno(stdout), _O_BINARY);
+#endif
+
 #ifdef HAVE_LIBZ
 			if (compresslevel != 0)
 			{

src/bin/pg_dump/pg_backup_archiver.c

@@ -2346,9 +2346,9 @@ _allocAH(const char *FileSpec, const ArchiveFormat fmt,
 		(AH->fSpec == NULL || strcmp(AH->fSpec, "") == 0))
 	{
 		if (mode == archModeWrite)
-			setmode(fileno(stdout), O_BINARY);
+			_setmode(fileno(stdout), O_BINARY);
 		else
-			setmode(fileno(stdin), O_BINARY);
+			_setmode(fileno(stdin), O_BINARY);
 	}
 #endif