msvfw32: Replace const pointer parameter with correct pointer to const

[Andrew Talbot]

Changelog:
    msvfw32: Replace const pointer parameters with correct pointers to const.

diff -urN a/dlls/msvfw32/drawdib.c b/dlls/msvfw32/drawdib.c
--- a/dlls/msvfw32/drawdib.c	2006-10-12 21:31:02.000000000 +0100
+++ b/dlls/msvfw32/drawdib.c	2007-03-05 18:48:04.000000000 +0000
@@ -53,7 +53,7 @@
     struct tagWINE_HDD* next;
 } WINE_HDD;
 
-static int num_colours(const LPBITMAPINFOHEADER lpbi)
+static int num_colours(const BITMAPINFOHEADER *lpbi)
 {
 	if(lpbi->biClrUsed)
 		return lpbi->biClrUsed;