Linux: Set O_CLOEXEC on evdev fd

Closes #2446

src/linux_joystick.c

@@ -135,7 +135,7 @@ static GLFWbool openJoystickDevice(const char* path)
     }
 
     _GLFWjoystickLinux linjs = {0};
-    linjs.fd = open(path, O_RDONLY | O_NONBLOCK);
+    linjs.fd = open(path, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
     if (linjs.fd == -1)
         return GLFW_FALSE;