RESTRICT AUTOMERGE Ignore weak symbol difference in libbinder ABI check

The diff_flags make the ABI checker ignore the weak symbol difference
caused by PGO and -DBINDER_RPC_DEV_SERVERS.

Test: make libbinder.vendor
Bug: 230079120
Change-Id: I55878c1b2653b33edd61756e269c86a110016351
1 file changed