[WiP] Add support for Mac Catalyst (#240)

src/NetVips/ModuleInitializer.cs

@@ -58,7 +58,7 @@ internal static string RemapLibraryName(string libraryName)
         // single shared library with all dependencies statically linked
         // without breaking compatibility with the shared builds
         // (i.e. what is usually installed via package managers).
-        return OperatingSystem.IsMacOS()
+        return OperatingSystem.IsMacOS() || OperatingSystem.IsMacCatalyst()
             ? "libvips.42.dylib"
             : "libvips.so.42";
     }