abg-comparison.h: Remove stray declaration

The functon is_reference_or_pointer_diff_to_non_basic_distinct_types
was declared in

ef9d20c9 Fix redundancy detection through fn ptr and typedef paths

but never defined. This commit removes it. There are no functional
changes.

	* include/abg-comparison
	(is_reference_or_pointer_diff_to_non_basic_distinct_types):
	Remove stray declaration.

Signed-off-by: Giuliano Procida <gprocida@google.com>
1 file changed