Several additions and bug fixes.

diff --git a/tools/winapi_check/winapi_documentation.pm b/tools/winapi_check/winapi_documentation.pm
index 78abc2b..36eb438 100644
--- a/tools/winapi_check/winapi_documentation.pm
+++ b/tools/winapi_check/winapi_documentation.pm
@@ -3,6 +3,7 @@
 use strict;
 
 use config qw($current_dir $wine_dir);
+use nativeapi qw($nativeapi);
 
 my %comment_width;
 my %comment_indent;