kbuild: don't warn about include/linux/version.h not including itself

This patch makes checkversion.pl not warn that include/linux/version.h
dosen't include itself.

Signed-off-by: Peter Foley <pefoley2@verizon.net>
[mmarek: simplified to use 'next if' syntax]
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/checkversion.pl

@@ -12,6 +12,7 @@
 my $debugging;
 
 foreach my $file (@ARGV) {
+    next if $file =~ "include/linux/version\.h";
     # Open this file.
     open( my $f, '<', $file )
       or die "Can't open $file: $!\n";