Images and PDF: explicitly use WIC2

Explicitly specify the version of the Windows Imaging Component to avoid
an ambiguous reference. Swift recently introduced the ability to import
aliasing macros. This now creates a second wrapper declaration that
overloads the unversioned alias. Windows 10 implicitly uses the new
version, so we can expand that macro manually and avoid the ambiguous
reference.

Author: compnerd

Sources/SwiftWin32/Images and PDF/Image.swift

@@ -9,7 +9,7 @@ import CoreGraphics
 #endif
 
 private let WICImagingFactory: SwiftCOM.IWICImagingFactory? =
-    try? IWICImagingFactory.CreateInstance(class: CLSID_WICImagingFactory)
+    try? IWICImagingFactory.CreateInstance(class: CLSID_WICImagingFactory2)
 
 extension Image {
   /// A configuration object that contains the traits that the system uses when