kbuild: [PATCH] Remove checkhelp.pl and header.tk

From Brian Gerst:

> Changes in the config system have obsoleted these files.

scripts/checkhelp.pl

-#!/usr/bin/perl
-# checkhelp.pl - finds configuration options that have no
-#                corresponding section in the help file
-#
-# made by Meelis Roos (mroos@tartu.cyber.ee)
-
-# read the help file
-@options=split /\n/, `grep '^CONFIG' Documentation/Configure.help`;
-die "Can't read Documentation/Configure.help\n" if $#options == -1;
-
-#read all the files
-foreach $file (@ARGV)
-{
-	open (FILE, $file) || die "Can't open $file: $!\n";
-	while (<FILE>) {
-		# repeat until no CONFIG_* are left
-		while (/^\s*(bool|tristate|dep_tristate|string|int|hex).*' *(.*)'.*(CONFIG_\w*)/) {
-			$what=$3;
-			$name=$2;
-			s/$3//;
-			@found = grep (/$what$/, @options);
-			if ($#found == -1) {
-				next if $nohelp{$what};
-				print "$name\n$what\n  No help for $what\n\n";
-				$nohelp{$what}=1;
-			}
-		}
-	}
-	close (FILE);
-}