- Drop gdb-6.8-glibc-headers-compat.patch: GNU/Linux irrelevant (Tom Tromey).
    - Drop gdb-6.3-terminal-fix-20050214.patch: The bug is not reproducible.
    - Drop gdb-6.7-kernel-headers-compat.patch: kernel-headers seem to be fixed.
    - Drop gdb-archer-ada.patch: No longer needed for Ada (Keith Seitz).
    - New PR backtrace/12237, drop gdb-6.3-framepczero-20040927.patch
      gdb-6.3-bt-past-zero-20051201.patch as they already had no effect.
    - Drop gdb-6.8-gcc35998-ada-memory-trash.patch as a different fix is upstream.
    - Drop gdb-6.3-inheritance-20050324.patch: the call is redundent (Tom Tromey).
    - Drop gdb-6.3-large-core-20051206.patch: obsoleted by MAX_COPY_BYTES.