Revert "term: obtain the cursor position via termios.h (#11372)"

This reverts commit af28d09630.

vlib/readline/readline.v

@@ -7,6 +7,18 @@
 //
 module readline
 
+// Termios stores the terminal options on Linux.
+struct C.termios {}
+
+struct Termios {
+mut:
+	c_iflag int
+	c_oflag int
+	c_cflag int
+	c_lflag int
+	c_cc    [12]int // NCCS == 12. Can't use the defined value here
+}
+
 // Winsize stores the screen information on Linux.
 struct Winsize {
 	ws_row    u16