BURIED: Add detection for Canadian demo

I'm half-jokingly calling it Canadian because Sanctuary Woods was
located there, but it is clearly North American based on the telephone
number.

The demo before this was published by US Gold, a British publisher,
and based on the Manchester phone number, this one is intended for the
UK.

I don't have a copy of the third demo.

engines/buried/detection_tables.h

@@ -351,7 +351,7 @@ static const ADGameDescription gameDescriptions[] = {
 		GUIO1(GUIO_NOLAUNCHLOAD)
 	},
 
-	// English Windows Demo 8BPP
+	// English Windows Demo 8BPP - US Gold (UK)
 	{
 		"buried",
 		"Demo 8BPP",
@@ -362,7 +362,7 @@ static const ADGameDescription gameDescriptions[] = {
 		GUIO1(GUIO_NOLAUNCHLOAD)
 	},
 
-	// English Windows Demo 24BPP
+	// English Windows Demo 24BPP - US Gold (UK)
 	{
 		"buried",
 		"Demo 24BPP",
@@ -373,6 +373,28 @@ static const ADGameDescription gameDescriptions[] = {
 		GUIO1(GUIO_NOLAUNCHLOAD)
 	},
 
+	// English Windows Demo 8BPP - North America
+	{
+		"buried",
+		"Demo 8BPP",
+		AD_ENTRY1s("BIT816.EXE", "30bbd89d7df8cb319e654a441efce877", 1259072),
+		Common::EN_ANY,
+		Common::kPlatformWindows,
+		ADGF_DEMO | GF_TRUECOLOR | ADGF_TESTING,
+		GUIO1(GUIO_NOLAUNCHLOAD)
+	},
+
+	// English Windows Demo 24BPP - North America
+	{
+		"buried",
+		"Demo 24BPP",
+		AD_ENTRY1s("BIT2416.EXE", "69ba6611561c3eb5f7d8853ef913aa09", 2816256),
+		Common::EN_ANY,
+		Common::kPlatformWindows,
+		ADGF_DEMO | GF_TRUECOLOR | ADGF_TESTING,
+		GUIO1(GUIO_NOLAUNCHLOAD)
+	},
+
 	// English Windows 3.11 Trial 8BPP
 	// v1.1
 	{