DWARF reader: avoid C++20 operator!= overload ambiguity am: ecd56004f4 am: 799643eb9a

Original change: https://android-review.googlesource.com/c/platform/external/libabigail/+/2379789

Change-Id: I810d84d22c2dba2660fba312db56ea2af58d13cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>