[win32] Dynamic handle creation for Path

This commit adapts Path in the win32 implementation to create handles
only on demand. If a non-handle specific operation like getBounds() is
called, a temporary handle will be created and disposed afterwards if no
handle exists already.

Author: akoch-yatta

bundles/org.eclipse.swt/Eclipse SWT Tests/win32/org/eclipse/swt/graphics/PathWin32Tests.java

@@ -82,7 +82,7 @@ public void testCreatePathHandleWithDisposedPathInvolved() {
 		path.addArc(0, 0, 10, 10, 0, 90);
 
 		Path path2 = new Path(display);
-		path.addArc(0, 0, 30, 30, 0, 270);
+		path2.addArc(0, 0, 30, 30, 0, 270);
 
 		path.addPath(path2);
 
@@ -91,4 +91,5 @@ public void testCreatePathHandleWithDisposedPathInvolved() {
 		path.getHandle(200);
 		path.dispose();
 	}
+
 }