Disable Tool Box on Linux (fixes #2741)

Was going to Close() the instances made by ToolBox.SetTools, which is probably a
good idea still, but it didn't cause my overridden LogWindow.OnClosing to run so
I gave up. The Tool Box is dumb anyway.

src/BizHawk.Client.EmuHawk/MainForm.Hotkey.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Linq;
+
+using BizHawk.Common;
 using BizHawk.Emulation.Common;
 using BizHawk.Emulation.Cores.Consoles.Nintendo.NDS;
 using BizHawk.Emulation.Cores.Nintendo.Gameboy;
@@ -349,7 +351,7 @@ namespace BizHawk.Client.EmuHawk
 					Tools.Load<TAStudio>();
 					break;
 				case "ToolBox":
-					Tools.Load<ToolBox>();
+					if (!OSTailoredCode.IsUnixHost) Tools.Load<ToolBox>();
 					break;
 				case "Virtual Pad":
 					Tools.Load<VirtualpadTool>();

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -349,6 +349,12 @@ namespace BizHawk.Client.EmuHawk
 #else
 			SynclessRecordingMenuItem.Enabled = false;
 #endif
+			if (OSTailoredCode.IsUnixHost)
+			{
+				ToolBoxMenuItem.Enabled = false;
+				ToolBoxMenuItem.Visible = false;
+				toolStripSeparator12.Visible = false;
+			}
 
 			Game = GameInfo.NullInstance;
 			_throttle = new Throttle();

src/BizHawk.Client.EmuHawk/tools/ToolBox.cs

@@ -25,6 +25,11 @@ namespace BizHawk.Client.EmuHawk
 
 		private void ToolBox_Load(object sender, EventArgs e)
 		{
+			if (OSTailoredCode.IsUnixHost)
+			{
+				Close();
+				return;
+			}
 			Location = new Point(
 				Owner.Location.X + Owner.Size.Width,
 				Owner.Location.Y
@@ -33,6 +38,7 @@ namespace BizHawk.Client.EmuHawk
 
 		public override void Restart()
 		{
+			if (OSTailoredCode.IsUnixHost) return;
 			SetTools();
 			SetSize();