vga: make some tables 'const'

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/vga.c

diff --git a/hw/vga.c b/hw/vga.c
index db72115..87a1bb0 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -1171,7 +1171,7 @@
     }
 }
 
-static vga_draw_glyph8_func *vga_draw_glyph8_table[NB_DEPTHS] = {
+static vga_draw_glyph8_func * const vga_draw_glyph8_table[NB_DEPTHS] = {
     vga_draw_glyph8_8,
     vga_draw_glyph8_16,
     vga_draw_glyph8_16,
@@ -1181,7 +1181,7 @@
     vga_draw_glyph8_16,
 };
 
-static vga_draw_glyph8_func *vga_draw_glyph16_table[NB_DEPTHS] = {
+static vga_draw_glyph8_func * const vga_draw_glyph16_table[NB_DEPTHS] = {
     vga_draw_glyph16_8,
     vga_draw_glyph16_16,
     vga_draw_glyph16_16,
@@ -1191,7 +1191,7 @@
     vga_draw_glyph16_16,
 };
 
-static vga_draw_glyph9_func *vga_draw_glyph9_table[NB_DEPTHS] = {
+static vga_draw_glyph9_func * const vga_draw_glyph9_table[NB_DEPTHS] = {
     vga_draw_glyph9_8,
     vga_draw_glyph9_16,
     vga_draw_glyph9_16,
@@ -1251,7 +1251,7 @@
 
 typedef unsigned int rgb_to_pixel_dup_func(unsigned int r, unsigned int g, unsigned b);
 
-static rgb_to_pixel_dup_func *rgb_to_pixel_dup_table[NB_DEPTHS] = {
+static rgb_to_pixel_dup_func * const rgb_to_pixel_dup_table[NB_DEPTHS] = {
     rgb_to_pixel8_dup,
     rgb_to_pixel15_dup,
     rgb_to_pixel16_dup,
@@ -1447,7 +1447,7 @@
     VGA_DRAW_LINE_NB,
 };
 
-static vga_draw_line_func *vga_draw_line_table[NB_DEPTHS * VGA_DRAW_LINE_NB] = {
+static vga_draw_line_func * const vga_draw_line_table[NB_DEPTHS * VGA_DRAW_LINE_NB] = {
     vga_draw_line2_8,
     vga_draw_line2_16,
     vga_draw_line2_16,