Version bump to OPR1.170608.004

Change-Id: Ibb0d4cba352862a8f11effe765e076b8c67fb25f
diff --git a/core/build_id.mk b/core/build_id.mk
index 777d1f6..d165050 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=OPR1.170608.003
+export BUILD_ID=OPR1.170608.004