Revert "staging/lustre: F_SETLKW64 F_SETLK64 F_GETLK64 are always defined"

This reverts commit caa88c26.

Turns out that Alpha doesn't define these values :(
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/file.c

@@ -2746,15 +2746,21 @@ ll_file_flock(struct file *file, int cmd, struct file_lock *file_lock)
 
 	switch (cmd) {
 	case F_SETLKW:
+#ifdef F_SETLKW64
 	case F_SETLKW64:
+#endif
 		flags = 0;
 		break;
 	case F_SETLK:
+#ifdef F_SETLK64
 	case F_SETLK64:
+#endif
 		flags = LDLM_FL_BLOCK_NOWAIT;
 		break;
 	case F_GETLK:
+#ifdef F_GETLK64
 	case F_GETLK64:
+#endif
 		flags = LDLM_FL_TEST_LOCK;
 		/* Save the old mode so that if the mode in the lock changes we
 		 * can decrement the appropriate reader or writer refcount.