[REVIEW] Remove unused HAVE_SPLICE macro

[donaldd@xxxxxxx (Donald Douwsma)]

Still more 2.4 build remnants to get rid of...

HAVE_SPLICE was part of the infrastructure for building 2.4 and 2.6
kernels out of the same tree. Now we don't build 2.4 kernels this 
way anymore its unused.

Signed-off-by: Donald Douwsma <donaldd@xxxxxxx>

--- a/fs/xfs/linux-2.6/xfs_linux.h      2008-04-08 13:23:55.000000000 +1000
+++ b/fs/xfs/linux-2.6/xfs_linux.h      2008-04-08 12:09:22.455341741 +1000
@@ -99,7 +99,6 @@
 /*
  * Feature macros (disable/enable)
  */
-#define HAVE_SPLICE    /* a splice(2) exists in 2.6, but not in 2.4 */
 #ifdef CONFIG_SMP
 #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
 #else