comctl32: Constify some variables (4 of 12)

[Andrew Talbot]

Changelog:
    comctl32: Constify some variables.

diff -urN a/dlls/comctl32/datetime.c b/dlls/comctl32/datetime.c
--- a/dlls/comctl32/datetime.c	2007-03-27 17:43:39.000000000 +0100
+++ b/dlls/comctl32/datetime.c	2007-03-31 14:49:34.000000000 +0100
@@ -137,7 +137,7 @@
 
 
 static DWORD
-DATETIME_GetSystemTime (DATETIME_INFO *infoPtr, SYSTEMTIME *lprgSysTimeArray)
+DATETIME_GetSystemTime (const DATETIME_INFO *infoPtr, SYSTEMTIME *lprgSysTimeArray)
 {
     if (!lprgSysTimeArray) return GDT_NONE;