Fixed several aspects of the GEOS CONIO implementation:

- cputc was drawing at the wrong position, therefore one line had to be removed as a workaround.
- chline, cvline were drawing one pixel to large lines.
- cclear was drawing an in both directions one pixel to big rect.
- the cursor was drawn at wrong times at wrong places in a wrong size.

git-svn-id: svn://svn.cc65.org/cc65/trunk@5874 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/geos-common/system/extzp.s

@@ -5,7 +5,7 @@
 ; zeropage locations for exclusive use by the library
 ;
 
-	    .exportzp cursor_x, cursor_y, cursor_flag
+	    .exportzp cursor_x, cursor_y
 	    .exportzp cursor_c, cursor_r
 
 .segment	"EXTZP" : zeropage
@@ -14,8 +14,6 @@ cursor_x:
 	.res 2			; Cursor column (0-319/639)
 cursor_y:
 	.res 1			; Cursor row    (0-199)
-cursor_flag:
-	.res 1			; Cursor on/off (0-off)
 
 cursor_c:
 	.res 1			; Cursor column (0-39/79)