[Win32] Add support for options in Winspool notifications API

Adds in the Java mappings for a number of structures required to
allow specifying complex options to `Winspool`s notification APIs.

Note that this is technically an API breaking change as the
definitions of `FindFirstPrinterChangeNotification()` and
`FindNextPrinterChangeNotification()` have had their parameters
changed from LPVOID to the appropriate structures. This is unlikely
to cause issues for users of the library though, as it wasn't possible
to use the functions in the way they were defined previously (unless
you were passing `null` in place of the structures).

Shout out to @matthiasblaesing for helping to fix the function
definitions - more info here:
https://groups.google.com/g/jna-users/c/FpWPY2c8bzY

contrib/monitordemo/build.xml

@@ -9,7 +9,7 @@
     <property name="classes"       location="${build}/classes"/>
     <property name="jar"           location="${build}/demo-monitordemo.jar"/>
     <property name="file.reference.jna.jar" location="../../build/jna.jar"/>
-    <property name="main-class"			value="com.sun.jna.contrib.demo.MonitorInfoDemo.java" />
+    <property name="main-class"			value="com.sun.jna.contrib.demo.MonitorInfoDemo" />
 
     <path id="classpath">
         <fileset file="${file.reference.jna.jar}"/>