Merge topic '16615-xcode-object-libraries-depends'

624021a0 Add test for object library dependencies
5da9266a Xcode: Always track object library dependencies via hacky Makefile
e80ac953 Xcode: Record dependency information also for object libraries
9293e57d Xcode: Collect dummy rules during iteration and emit afterwards
33a1d727 Makefile: Allow adding post-build rules to object libraries