- Warn about directories specified in modules.dat that are not used.
- Eliminated the warnings caused by the change above.
- Minor API files update.
- Minor bug fixes.

diff --git a/tools/winapi_check/nativeapi.dat b/tools/winapi_check/nativeapi.dat
index 6e0c0af..512ed1a 100644
--- a/tools/winapi_check/nativeapi.dat
+++ b/tools/winapi_check/nativeapi.dat
@@ -241,6 +241,7 @@
 usleep
 utime
 vfprintf
+vsnprintf
 vsprintf
 wait4
 write