gdi: Constify data.
diff --git a/dlls/gdi/dib.c b/dlls/gdi/dib.c
index 3ba389a..547159a 100644
--- a/dlls/gdi/dib.c
+++ b/dlls/gdi/dib.c
@@ -421,7 +421,7 @@
    NB. RGBQUAD and PALETTEENTRY have different orderings of red, green
    and blue - sigh */
 
-static RGBQUAD EGAColorsQuads[16] = {
+static const RGBQUAD EGAColorsQuads[16] = {
 /* rgbBlue, rgbGreen, rgbRed, rgbReserved */
     { 0x00, 0x00, 0x00, 0x00 },
     { 0x00, 0x00, 0x80, 0x00 },
@@ -441,7 +441,7 @@
     { 0xff, 0xff, 0xff, 0x00 }
 };
 
-static RGBTRIPLE EGAColorsTriples[16] = {
+static const RGBTRIPLE EGAColorsTriples[16] = {
 /* rgbBlue, rgbGreen, rgbRed */
     { 0x00, 0x00, 0x00 },
     { 0x00, 0x00, 0x80 },
@@ -461,7 +461,7 @@
     { 0xff, 0xff, 0xff }
 };
 
-static RGBQUAD DefLogPaletteQuads[20] = { /* Copy of Default Logical Palette */
+static const RGBQUAD DefLogPaletteQuads[20] = { /* Copy of Default Logical Palette */
 /* rgbBlue, rgbGreen, rgbRed, rgbReserved */
     { 0x00, 0x00, 0x00, 0x00 },
     { 0x00, 0x00, 0x80, 0x00 },
@@ -485,7 +485,7 @@
     { 0xff, 0xff, 0xff, 0x00 }
 };
 
-static RGBTRIPLE DefLogPaletteTriples[20] = { /* Copy of Default Logical Palette */
+static const RGBTRIPLE DefLogPaletteTriples[20] = { /* Copy of Default Logical Palette */
 /* rgbBlue, rgbGreen, rgbRed */
     { 0x00, 0x00, 0x00 },
     { 0x00, 0x00, 0x80 },