camera3: Update CameraMetadata vendor tag handling.

Bug: 12134423
Change-Id: I1d1be6792b6a4c9f08e042a8b2c89146bde5665e
diff --git a/camera/Android.mk b/camera/Android.mk
index 5774b6f..18800b4 100644
--- a/camera/Android.mk
+++ b/camera/Android.mk
@@ -52,6 +52,11 @@
 	system/media/camera/include \
 	system/media/private/camera/include
 
+## Enable asserts for 'eng' builds
+ifeq ($(TARGET_BUILD_VARIANT),eng)
+LOCAL_CFLAGS += -UNDEBUG
+endif
+
 LOCAL_MODULE:= libcamera_client
 
 include $(BUILD_SHARED_LIBRARY)