Only keep methods with correct signature for view/menu click

For View's onClick attribute the method must have a single argument of type android.view.View. For a MenuItem's onClick attribute the method must have a single argument of type android.view.MenuItem. Since these rules match all types and any return type, matching by signature is the only available specificity that can be added.

Bug: 37123156
Test: make aapt2_tests
Change-Id: I4b82f5ef9e62a8ecffaab424e269df627825709e