Support arbitrary-length properties in property_list.

Bug: http://b/33926793
Test: visual inspection
Change-Id: Ida84c3aaafa5411a9886f8d3d45679fd60ddc00d
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index b96e3ae..1cec781 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -80,7 +80,7 @@
                 "ashmem-dev.c",
                 "klog.cpp",
                 "partition_utils.c",
-                "properties.c",
+                "properties.cpp",
                 "qtaguid.c",
                 "trace-dev.c",
                 "uevent.c",