add --serial option in premake, added serial library to test vr glove in C++ (pybullet works already fine)

build3/premake4.lua

@@ -158,6 +158,12 @@ end
 		description = "Double precision version of Bullet"
 	}
 	
+	newoption
+	{
+		trigger = "serial",
+		description = "Enable serial, for testing the VR glove in C++"
+	}
+	
 	newoption
 	{
 		trigger = "audio",
@@ -259,6 +265,10 @@ end
 		include "../examples/TinyAudio"
 	end
 
+	if _OPTIONS["serial"] then
+		include "../examples/ThirdPartyLibs/serial"
+	end
+
 	if not _OPTIONS["no-demos"] then
 		include "../examples/ExampleBrowser"
 		include "../examples/RobotSimulator"