perf block-range: Add missing headers

Some are being obtained indirectly and as we prune unnecessary includes,
this stops working, fix it by adding the headers for things used in
these file.

Cc: Adrian Hunter <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Link: https://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/block-range.c

···
 // SPDX-License-Identifier: GPL-2.0
 #include "block-range.h"
 #include "annotate.h"
+#include <assert.h>
+#include <stdlib.h>
 
 struct {
 	struct rb_root root;

tools/perf/util/block-range.h

···
 #ifndef __PERF_BLOCK_RANGE_H
 #define __PERF_BLOCK_RANGE_H
 
-#include "symbol.h"
+#include <stdbool.h>
+#include <linux/rbtree.h>
+#include <linux/types.h>
+
+struct symbol;
 
 /*
  * struct block_range - non-overlapping parts of basic blocks