[mmp] Only iOS has dual bitness now, no need to check for Xamarin.Mac. (#8076)

tools/common/Application.cs

@@ -418,7 +418,7 @@ namespace Xamarin.Bundler {
 #endif
 			};
 
-			if (Platform == ApplePlatform.iOS || Platform == ApplePlatform.MacOSX) {
+			if (Platform == ApplePlatform.iOS) {
 				if (Is32Build) {
 					resolver.ArchDirectory = Driver.GetArch32Directory (this);
 				} else {