windows.cfg: Added support for _vsnprintf and _vsnwprintf functions.

cfg/windows.cfg

@@ -1797,4 +1797,24 @@ HFONT CreateFont(
     </arg>
     <arg nr="4"/>
   </function>
+  <!-- int _vsnprintf(char *buffer, size_t count, const char *format, va_list argptr);
+       int _vsnwprintf(wchar_t *buffer, size_t count, const wchar_t *format, va_list argptr);-->
+  <function name="_vsnprintf,_vsnwprintf">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-uninit/>
+      <minsize type="argvalue" arg="2"/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+    <formatstr/>
+    <arg nr="3">
+      <formatstr/>
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="4"/>
+  </function>
 </def>