std.cfg: Added missing <formatstr/> configuration to vswprintf().

Author: orbitcowboy

cfg/std.cfg

@@ -6043,6 +6043,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <arg nr="3" direction="in">
       <not-null/>
       <not-uninit/>
+      <formatstr/>
     </arg>
     <arg nr="4"/>
   </function>