Allow to run Proguard on static Java library

1. Let aapt output the proguard_options file
2. If proguard is enabled, switch the dependency from
$(full_classes_jar) to $(full_classes_proguard_jar).

Change-Id: Idc641a1515b8899a4623a2aeec5cd494f6c1c1c5
2 files changed