kconfig: clean up header inclusion

- Add missing includes.
- Remove no longer necessary includes.

Signed-off-by: Boris Kolpackov <boris@codesynthesis.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/kconfig/conf.c

@@ -11,7 +11,6 @@
 #include <time.h>
 #include <unistd.h>
 #include <getopt.h>
-#include <sys/stat.h>
 #include <sys/time.h>
 #include <errno.h>
 

scripts/kconfig/confdata.c

@@ -5,6 +5,7 @@
 
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>

scripts/kconfig/lexer.l

@@ -12,7 +12,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 
 #include "lkc.h"
 #include "parser.tab.h"

scripts/kconfig/symbol.c

@@ -3,11 +3,11 @@
  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
  */
 
+#include <sys/types.h>
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
 #include <regex.h>
-#include <sys/utsname.h>
 
 #include "lkc.h"