perf tools: Remove unneeded code for tracking the cwd in perf sessions

Tidy-up patch to remove some code and struct perf_session data members
which are no longer needed due to the previous patch: "perf tools: Don't
abbreviate file paths relative to the cwd".

LKML-Reference: <new-submission>
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 9989072..44a47e1 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -43,10 +43,8 @@
 	if (session == NULL)
 		return -1;
 
-	if (with_hits) {
-		symbol_conf.full_paths = true;
+	if (with_hits)
 		perf_session__process_events(session, &build_id__mark_dso_hit_ops);
-	}
 
 	perf_session__fprintf_dsos_buildid(session, stdout, with_hits);