GLib creates two static inline functions for paramaters that may
not be used that set off warnings in clang but not gcc.
Ignore these on clang builds everywhere that
G_DEFINE_AUTOPTR_CLEANUP_FUNC is used.
This was a mistake originally for two reasons:
* The only device to use ELF as a deliverable is the altos devices
* ELF has nothing to do with the DFU specification
This moves the code to where it belongs.
