kconfig_lint: Skip temp files when looking for unused Kconfig files.

Don't warn on Kconfig.orig and Kconfig~ files when trying to verify
that all the Kconfig files in the coreboot source tree are being loaded.

Change-Id: Ie7babe60b29735e5ccc5f93f4e42ad82dfb47044
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/13462
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/lint/kconfig_lint

@@ -1168,7 +1168,11 @@ sub print_wholeconfig {
 #-------------------------------------------------------------------------------
 sub check_if_file_referenced {
     my $filename = $File::Find::name;
-    if ( ( $filename =~ /Kconfig/ ) && ( !exists $loaded_files{$filename} ) ) {
+    if (   ( $filename =~ /Kconfig/ )
+        && ( !$filename =~ /\.orig$/ )
+        && ( !$filename =~ /~$/ )
+        && ( !exists $loaded_files{$filename} ) )
+    {
         show_warning("'$filename' is never referenced");
     }
 }