setupapi: Constify some variables

[Andrew Talbot]

Changelog:
    setupapi: Constify some variables.

diff -urN a/dlls/setupapi/virtcopy.c b/dlls/setupapi/virtcopy.c
--- a/dlls/setupapi/virtcopy.c	2007-05-25 20:46:03.000000000 +0100
+++ b/dlls/setupapi/virtcopy.c	2007-08-28 19:52:04.000000000 +0100
@@ -219,7 +219,8 @@
 static DWORD vn_num = 0;
 static DWORD vn_last = 0;
 
-static RETERR16 VCP_VirtnodeCreate(LPVCPFILESPEC vfsSrc, LPVCPFILESPEC vfsDst, WORD fl, LPARAM lParam, LPEXPANDVTBL lpExpandVtbl)
+static RETERR16 VCP_VirtnodeCreate(const VCPFILESPEC *vfsSrc, const VCPFILESPEC *vfsDst,
+                                   WORD fl, LPARAM lParam, LPEXPANDVTBL lpExpandVtbl)
 {
     HANDLE heap;
     LPVIRTNODE lpvn;