Clean up previous fix by using Environment.Is64BitProcess instead of invoking Mono --version.

Thanks to Dimitar for the idea.

src/Generator.Tests/GeneratorTest.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Diagnostics;
 using System.IO;
 using System.Reflection;
 using System.Text.RegularExpressions;
@@ -44,7 +43,7 @@ namespace CppSharp.Utils
                 options.SharedLibraryName += ".dll";
 
             if (Platform.IsMacOS)
-                options.TargetTriple = Is32bitMono() ? "i686-apple-darwin" : "x86_64-apple-darwin";
+                options.TargetTriple = Environment.Is64BitProcess ? "x86_64-apple-darwin" : "i686-apple-darwin";
 
             var path = Path.GetFullPath(GetTestsDirectory(name));
             options.addIncludeDirs(path);
@@ -121,24 +120,6 @@ namespace CppSharp.Utils
 
             throw new Exception("Could not find tests output directory");
         }
-
-        static bool Is32bitMono()
-        {
-            var process = new Process();
-            process.StartInfo.FileName = "mono";
-            process.StartInfo.Arguments = "--version";
-            process.StartInfo.CreateNoWindow = true;
-            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
-            process.StartInfo.UseShellExecute = false;
-            process.StartInfo.RedirectStandardError = true;
-            process.StartInfo.RedirectStandardOutput = true;
-            process.Start();
-
-            var output = process.StandardOutput.ReadToEnd();
-            process.WaitForExit();
-
-            return output.Contains("x86");
-        }
         #endregion
     }