Fix Alpha O_CLOEXEC definition

The default definition in asm-generic conflicts with Alpha's O_DIRECT,
so, like several other arches, it needs to be redefined.
Signed-off-by: NRichard Hendersion  <rth@twiddle.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/asm-alpha/fcntl.h

@@ -16,6 +16,7 @@
 #define O_LARGEFILE	0400000 /* will be set by the kernel on every open */
 #define O_DIRECT	02000000 /* direct disk access - should check with OSF/1 */
 #define O_NOATIME	04000000
+#define O_CLOEXEC	010000000 /* set close_on_exec */
 
 #define F_GETLK		7
 #define F_SETLK		8