perf sort: Remove hist_entry__sort_list() and sort__first_dimension() leftover declarations

The hist_entry__sort_list and sort__first_dimension functions have been
removed in commit cfaa154b ("perf tools: Get rid of obsolete
hist_entry__sort_list"), remove them.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20220909044542.1087870-2-cuigaosheng1@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/sort.h

@@ -34,7 +34,6 @@ extern struct sort_entry sort_dso_to;
 extern struct sort_entry sort_sym_from;
 extern struct sort_entry sort_sym_to;
 extern struct sort_entry sort_srcline;
-extern enum sort_type sort__first_dimension;
 extern const char default_mem_sort_order[];
 
 struct res_sample {
@@ -295,7 +294,6 @@ struct block_hist {
 };
 
 extern struct sort_entry sort_thread;
-extern struct list_head hist_entry__sort_list;
 
 struct evlist;
 struct tep_handle;