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/libraries/LibC/include/sys/ioctl.h

@@ -41,6 +41,8 @@ struct winsize
 {
 	unsigned short ws_row;
 	unsigned short ws_col;
+	unsigned short ws_xpixel; /* unused by kernel */
+	unsigned short ws_ypixel; /* unused by kernel */
 };
 #define TIOCGWINSZ	50
 #define TIOCSWINSZ	51