Version bump to OPR4.170808.004

Change-Id: Iff349425ac0f56cc1d335134a7c455a873ff8d75
diff --git a/core/build_id.mk b/core/build_id.mk
index 8bd2ca3..61cd02d 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=OPR4.170808.003
+export BUILD_ID=OPR4.170808.004