TARGET_RELEASE is unavailable here, so don't print it.

Test: m
Change-Id: Iacb00db54882ed2578ca1aa1d8e71d5732fbe247
diff --git a/ui/build/dumpvars.go b/ui/build/dumpvars.go
index b83b5cb..efe7478 100644
--- a/ui/build/dumpvars.go
+++ b/ui/build/dumpvars.go
@@ -150,7 +150,6 @@
 	"PRODUCT_INCLUDE_TAGS",
 	"PRODUCT_SOURCE_ROOT_DIRS",
 	"TARGET_PRODUCT",
-	"TARGET_RELEASE",
 	"TARGET_BUILD_VARIANT",
 	"TARGET_BUILD_APPS",
 	"TARGET_BUILD_UNBUNDLED",