shlwapi: Write-strings warnings fix

[Andrew Talbot]

Changelog:
    shlwapi: Write-strings warnings fix.

diff -urN a/dlls/shlwapi/ordinal.c b/dlls/shlwapi/ordinal.c
--- a/dlls/shlwapi/ordinal.c	2006-06-20 22:05:17.000000000 +0100
+++ b/dlls/shlwapi/ordinal.c	2006-08-08 18:45:07.000000000 +0100
@@ -2281,7 +2281,7 @@
  *
  * Insert element into an FDSA array
  */
-DWORD WINAPI FDSA_InsertItem(FDSA_info *info, DWORD where, void *block)
+DWORD WINAPI FDSA_InsertItem(FDSA_info *info, DWORD where, const void *block)
 {
     TRACE("(%p 0x%08lx %p)\n", info, where, block);
     if(where > info->num_items)