Version bump to OPR4.170623.012

Change-Id: I2fb1764f874bb7aef93c3c144405b749973dfa60
diff --git a/core/build_id.mk b/core/build_id.mk
index f04b94d..d324eaa 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=OPR4.170623.011
+export BUILD_ID=OPR4.170623.012