perf debuginfo: Fix the build with !HAVE_DWARF_SUPPORT

perf debuginfo: Fix the build with !HAVE_DWARF_SUPPORT

In that case we have a set of placeholder functions, one of them uses a
'Dwarf_Addr' type that is not present as it is defined in the missing
DWARF libraries, so provide a placeholder typedef for that as well.

The build error before this patch:

  In file included from util/annotate.c:28:
  util/debuginfo.h:44:46: error: unknown type name ‘Dwarf_Addr’
     44 |                                              Dwarf_Addr *offs __maybe_unused,
        |                                              ^~~~~~~~~~
  make[6]: *** [/home/acme/git/perf-tools-next/tools/build/Makefile.build:106: util/annotate.o] Error 1
  make[6]: *** Waiting for unfinished jobs....

Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Link: https://lore.kernel.org/lkml/CAM9d7ciushSwEfj7yW4rtDEJBTcCB991V4cswwFEL+cv6QF2pg@mail.gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>