ui/cursor: remove cursor_get_mono_image

cursor_get_mono_image has been unused since 2018's
  0015ca5cba ("ui: remove support for SDL1.2 in favour of SDL2")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <dave@treblig.org>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

include/ui/console.h

@@ -175,7 +175,6 @@ int cursor_get_mono_bpl(QEMUCursor *c);
 void cursor_set_mono(QEMUCursor *c,
                      uint32_t foreground, uint32_t background, uint8_t *image,
                      int transparent, uint8_t *mask);
-void cursor_get_mono_image(QEMUCursor *c, int foreground, uint8_t *mask);
 void cursor_get_mono_mask(QEMUCursor *c, int transparent, uint8_t *mask);
 
 typedef void *QEMUGLContext;

ui/cursor.c

@@ -197,30 +197,6 @@ void cursor_set_mono(QEMUCursor *c,
     }
 }
 
-void cursor_get_mono_image(QEMUCursor *c, int foreground, uint8_t *image)
-{
-    uint32_t *data = c->data;
-    uint8_t bit;
-    int x,y,bpl;
-
-    bpl = cursor_get_mono_bpl(c);
-    memset(image, 0, bpl * c->height);
-    for (y = 0; y < c->height; y++) {
-        bit = 0x80;
-        for (x = 0; x < c->width; x++, data++) {
-            if (((*data & 0xff000000) == 0xff000000) &&
-                ((*data & 0x00ffffff) == foreground)) {
-                image[x/8] |= bit;
-            }
-            bit >>= 1;
-            if (bit == 0) {
-                bit = 0x80;
-            }
-        }
-        image += bpl;
-    }
-}
-
 void cursor_get_mono_mask(QEMUCursor *c, int transparent, uint8_t *mask)
 {
     uint32_t *data = c->data;