Add missing 'explicit's on single-argument constructors.

Change-Id: I1494df6e74ec16238971fb4346ba184eb61c37ab
diff --git a/Android.mk b/Android.mk
index 995ddae..4ec396b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -247,7 +247,9 @@
 # "mm cpplint-art" to style check art source files
 .PHONY: cpplint-art
 cpplint-art:
-	$(LOCAL_PATH)/tools/cpplint.py $(LOCAL_PATH)/src/*.h $(LOCAL_PATH)/src/*.cc
+	./art/tools/cpplint.py \
+	    --filter=-whitespace/comments,-whitespace/line_length,-build/include,-build/header_guard,-readability/streams,-readability/todo,-runtime/references \
+	    art/src/*.h art/src/*.cc
 
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