tree bbc900ed210d6946baad0bd27dc94573ec06eb80
parent aa77a9acb5273a1025d09d38d723b08e012fe37b
author Ying Wang <wangying@google.com> 1375380565 -0700
committer Ying Wang <wangying@google.com> 1375380565 -0700

Use target-specific variable (aka PRIVATE_* var)

so the build rules don't depend on global variables that may be modified
later in other makefiles.
Also fixed an error introduced by the previous cleanup change.

Change-Id: I2cecc94f06433bb594e3eff3f429f4d65e217f25