Kernel/LibC: Rework TIOC{G,S}WINSZ more linux like

Userspace can freely set terminal size, kernel just updates it when for
example new font is loaded. Also SIGWINCH is now sent by kernel instead
of userspace.

userspace/programs/less/main.cpp

@@ -328,7 +328,7 @@ int main(int argc, char** argv)
 		tcsetattr(kb_fd, TCSANOW, &termios);
 	}
 
-	winsize ws { .ws_row = 0, .ws_col = 0 };
+	winsize ws {};
 	if (isatty(STDOUT_FILENO))
 	{
 		if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0)