Get rid of the winapi_check_dir config parameter.

diff --git a/tools/winapi/winapi_extract b/tools/winapi/winapi_extract
index 4923556..70b3f5a 100755
--- a/tools/winapi/winapi_extract
+++ b/tools/winapi/winapi_extract
@@ -26,7 +26,7 @@
 
 use config qw(
     file_type files_skip files_filter get_spec_files
-    $current_dir $wine_dir $winapi_dir $winapi_check_dir
+    $current_dir $wine_dir $winapi_dir
 );
 use output qw($output);
 use winapi_extract_options qw($options);