make uzebox and pcfx games not throw an exception on load, fixes #2022

src/BizHawk.Client.Common/SystemInfo.cs

@@ -231,6 +231,10 @@ namespace BizHawk.Client.Common
 
 		public static SystemInfo Sgb { get; } = new SystemInfo("SGB", CoreSystem.SuperGameBoy, 4);
 
+		public static SystemInfo Pcfx { get; } = new SystemInfo("PCFX", CoreSystem.PcFx, 1);
+
+		public static SystemInfo UzeBox { get; } = new SystemInfo("uzem", CoreSystem.UzeBox, 1);
+
 		/// <summary>
 		/// Get a <see cref="SystemInfo"/> by its <see cref="CoreSystem"/>
 		/// </summary>

src/BizHawk.Client.EmuHawk/Extensions/CoreExtensions.cs

@@ -142,6 +142,10 @@ namespace BizHawk.Client.EmuHawk.CoreExtensions
 					return SystemInfo.O2;
 				case "MAME":
 					return SystemInfo.Mame;
+				case "uzem":
+					return SystemInfo.UzeBox;
+				case "PCFX":
+						return SystemInfo.Pcfx;
 			}
 		}
 	}