perf env: Remove env.h from other headers where just a fwd decl is needed

And fixup the fallout of c files not building due to now missing
headers.

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/arch/common.h

···
 #ifndef ARCH_PERF_COMMON_H
 #define ARCH_PERF_COMMON_H
 
-#include "../util/env.h"
+#include <stdbool.h>
+
+struct perf_env;
 
 int perf_env__lookup_objdump(struct perf_env *env, const char **path);
 bool perf_env__single_address_space(struct perf_env *env);

tools/perf/tests/mem2node.c

···
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/compiler.h>
 #include <linux/bitmap.h>
+#include <linux/kernel.h>
 #include <linux/zalloc.h>
 #include <perf/cpumap.h>
 #include "cpumap.h"
 #include "debug.h"
+#include "env.h"
 #include "mem2node.h"
 #include "tests.h"
 

tools/perf/util/cputopo.h

···
 #define __PERF_CPUTOPO_H
 
 #include <linux/types.h>
-#include "env.h"
 
 struct cpu_topology {
 	u32	  core_sib;

tools/perf/util/mem2node.c

···
 #include <errno.h>
 #include <inttypes.h>
 #include <linux/bitmap.h>
+#include <linux/kernel.h>
 #include <linux/zalloc.h>
 #include "debug.h"
+#include "env.h"
 #include "mem2node.h"
 
 struct phys_entry {

tools/perf/util/mem2node.h

···
 #define __MEM2NODE_H
 
 #include <linux/rbtree.h>
-#include "env.h"
+#include <linux/types.h>
 
+struct perf_env;
 struct phys_entry;
 
 struct mem2node {