Updated static_java_library.mk to support proguard options.

For reference we are trying to build an AAR and want to filter out anything private and anything marked @hide.

Test: built dist and verified package contents.

Change-Id: I2b9847501d677f56d3918ac0694e6e1f6cda32c8
Merged-In: I2b9847501d677f56d3918ac0694e6e1f6cda32c8
(cherry picked from commit 37926ded)