perf thread: Don't include symbol.h, symbol_conf.h is enough

Also add stdio.h to get the FILE definition.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-8vx5396phynuxhdsxxfbdhsk@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/thread.h

@@ -5,14 +5,17 @@
 #include <linux/refcount.h>
 #include <linux/rbtree.h>
 #include <linux/list.h>
+#include <stdio.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include "srccode.h"
-#include "symbol.h"
+#include "symbol_conf.h"
 #include <strlist.h>
 #include <intlist.h>
 #include "rwsem.h"
 
+struct addr_location;
+struct map;
 struct namespaces_event;
 struct thread_stack;
 struct unwind_libunwind_ops;