Update to kernel headers v4.9.6.

Test: Built arm/arm64/x86/x86_64 targets.
Change-Id: Id4d2711aaa96fe537f3726a0a89f2959e9cca34a
diff --git a/libc/kernel/uapi/linux/version.h b/libc/kernel/uapi/linux/version.h
index e2a421d..0fc7e59 100644
--- a/libc/kernel/uapi/linux/version.h
+++ b/libc/kernel/uapi/linux/version.h
@@ -16,5 +16,5 @@
  ***
  ****************************************************************************
  ****************************************************************************/
-#define LINUX_VERSION_CODE 264451
+#define LINUX_VERSION_CODE 264454
 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))