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

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

Change-Id: Ic7ca7265310f968d1c91632caf14f8aca2275e8b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>