(#91) Revert Linux startup check

Author: s1hofmann

src/startup.h

@@ -14,23 +14,4 @@ static void startupCheck(void)
 	} 
 }
 
-#elif defined(USE_X11)
-
-	#include "xdisplay.h"
-
-static void startupCheck(void) __attribute__((constructor));
-static void startupCheck(void)
-{
-	Display *display = XOpenDisplay(NULL);
-
-	int32_t majorOpcode;
-	int32_t firstEvent;
-	int32_t firstError;
-	bool isXTestAvailable = XQueryExtension(display, "XTEST", &majorOpcode, &firstEvent, &firstError);
-
-	if (!isXTestAvailable) {
-		std::cout << "##### WARNING! Your system is missing libXtst! Please visit https://github.com/nut-tree/nut.js#linux #####" << std::endl;
-	}
-}
-
 #endif