xnest icons: const correctness

Author: clhin

hw/xnest/Display.c

@@ -113,13 +113,13 @@ xnestOpenDisplay(int argc, char *argv[])
     xnestIconBitmap =
         xnest_create_bitmap_from_data(xnestUpstreamInfo.conn,
                                       xnestUpstreamInfo.screenInfo->root,
-                                      (char *) icon_bits, icon_width, icon_height);
+                                      (const char *) icon_bits, icon_width, icon_height);
 
     xnestScreenSaverPixmap =
         xnest_create_pixmap_from_bitmap_data(
                                     xnestUpstreamInfo.conn,
                                     xnestUpstreamInfo.screenInfo->root,
-                                    (char *) screensaver_bits,
+                                    (const char *) screensaver_bits,
                                     screensaver_width,
                                     screensaver_height,
                                     xnestUpstreamInfo.screenInfo->white_pixel,

hw/xnest/icon

@@ -1,6 +1,6 @@
 #define icon_width 32
 #define icon_height 32
-static unsigned char icon_bits[] = {
+static const unsigned char icon_bits[] = {
    0xff, 0x00, 0x00, 0xc0, 0xfe, 0x01, 0x00, 0xc0, 0xfc, 0x03, 0x00, 0x60,
    0xf8, 0x07, 0x00, 0x30, 0xf8, 0x07, 0x00, 0x18, 0xf0, 0x0f, 0x00, 0x0c,
    0xe0, 0x1f, 0x00, 0x06, 0xc0, 0x3f, 0x00, 0x06, 0xc0, 0x3f, 0x00, 0x03,

hw/xnest/screensaver

@@ -1,6 +1,6 @@
 #define screensaver_width 256
 #define screensaver_height 256
-static unsigned char screensaver_bits[] = {
+static const unsigned char screensaver_bits[] = {
    0xa8, 0x00, 0xa0, 0xaa, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x80, 0x02, 0x00,
    0x00, 0x00, 0x00, 0xa8, 0xaa, 0x02, 0x00, 0x80, 0x0a, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x54, 0x00, 0x40, 0x55,