Fix sample code issues

Correct min SDK.
Correct file extension on mandelbrot

Change-Id: I508c22c382f1a930b27d8c5f4414cac3a990a332
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 1779114..f8ceff3 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -139,6 +139,7 @@
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/ImageProcessing_intermediates)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/framework_intermediates/src/telephony/java/com/android/internal/telephony/IExtendedNetworkService.java)
 $(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/framework_intermediates/src/telephony/java/com/android/internal/telephony/IExtendedNetworkService.P)
+$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/ImageProcessing_intermediates)
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************