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

vlib/term/declarations_linux.c.v

@@ -0,0 +1,11 @@
+module term
+
+pub struct C.termios {
+mut:
+	c_iflag int
+	c_oflag int
+	c_cflag int
+	c_lflag int
+	c_line  byte
+	c_cc    [10]int
+}