Added Secur32#QueryContextAttributes

[barney2k7]

e.g. to retrieve package info

[matthiasblaesing]

@barney2k7 this looks good. Could you please:

• squash the commits into one change (rewrite history, squash the changes into one commit and force a push to github)
• replace the "System.out" in Secur32Test with asserts -- I'd suggest this:

--- a/contrib/platform/test/com/sun/jna/platform/win32/Secur32Test.java
+++ b/contrib/platform/test/com/sun/jna/platform/win32/Secur32Test.java
@@ -392,8 +392,14 @@
                 Secur32.INSTANCE.QueryContextAttributes(phServerContext, Sspi.SECPKG_ATTR_PACKAGE_INFO, packageinfo));
         ByReference info = packageinfo.PackageInfo;
 
-        System.out.println("used security package: " + info.Name + " " + info.Comment);
+//        System.out.println("used security package: " + info.Name + " " + info.Comment);
 
+        assertNotNull(info.Name);
+        assertNotNull(info.Comment);
+        
+        assertTrue(! info.Name.isEmpty());
+        assertTrue(! info.Comment.isEmpty());
+
         assertEquals(W32Errors.SEC_E_OK, Secur32.INSTANCE.FreeContextBuffer(info.getPointer()));
 
         // release server context

[barney2k7]

Updated the test case and squashed the commits, as @matthiasblaesing suggested.

[matthiasblaesing]

Thank you!