dtc: Bump version to v1.4.5

Preparing for another release.  No particular trigger for this, just a
number of accumulated enhancements since v1.4.4.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Makefile

diff --git a/Makefile b/Makefile
index 782a085..e1e138a 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@
 #
 VERSION = 1
 PATCHLEVEL = 4
-SUBLEVEL = 4
+SUBLEVEL = 5
 EXTRAVERSION =
 LOCAL_VERSION =
 CONFIG_LOCALVERSION =