The "colors" parameter of SetDIBColorTable should be CONST.

diff --git a/dlls/gdi/dib.c b/dlls/gdi/dib.c
index 410295e..83952f0 100644
--- a/dlls/gdi/dib.c
+++ b/dlls/gdi/dib.c
@@ -308,7 +308,7 @@
 /***********************************************************************
  *           SetDIBColorTable    (GDI32.@)
  */
-UINT WINAPI SetDIBColorTable( HDC hdc, UINT startpos, UINT entries, RGBQUAD *colors )
+UINT WINAPI SetDIBColorTable( HDC hdc, UINT startpos, UINT entries, CONST RGBQUAD *colors )
 {
     DC * dc;
     UINT result = 0;