perf llvm-add2line: Remove unused symbol_conf.h include

perf llvm-add2line: Remove unused symbol_conf.h include

Remove unused symbol_conf.h include.

First, it's just unused. Second, it's problematic since this is a C++
file, and most perf headers don't compile as C++. So if any other
includes are added to symbol_conf.h, it may break the build.

Signed-off-by: Dmitriy Vyukov <dvyukov@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20250108070248.237943-1-dvyukov@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>