Hide console window during pdb2mdb running

Author: veblush

core/IncrementalCompiler/Compiler.cs

@@ -267,6 +267,7 @@ public static int ConvertPdb2Mdb(string dllFile)
             var toolPath = Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), "pdb2mdb.exe");
             var process = new Process();
             process.StartInfo = new ProcessStartInfo(toolPath, '"' + dllFile + '"');
+            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
             process.Start();
             process.WaitForExit();
             return process.ExitCode;