shell32: Constify some variables

[Andrew Talbot]

Changelog:
    shell32: Constify some variables.

diff -urN a/dlls/shell32/pidl.c b/dlls/shell32/pidl.c
--- a/dlls/shell32/pidl.c	2007-05-21 15:42:00.000000000 +0100
+++ b/dlls/shell32/pidl.c	2007-09-11 23:34:23.000000000 +0100
@@ -2304,7 +2304,7 @@
  *
  * copies an aPidl struct
  */
-LPITEMIDLIST* _ILCopyaPidl(LPCITEMIDLIST * apidlsrc, UINT cidl)
+LPITEMIDLIST* _ILCopyaPidl(const LPCITEMIDLIST * apidlsrc, UINT cidl)
 {
     UINT i;
     LPITEMIDLIST *apidldest;
@@ -2324,7 +2324,7 @@
  *
  * creates aPidl from CIDA
  */
-LPITEMIDLIST* _ILCopyCidaToaPidl(LPITEMIDLIST* pidl, LPIDA cida)
+LPITEMIDLIST* _ILCopyCidaToaPidl(LPITEMIDLIST* pidl, const CIDA * cida)
 {
     UINT i;
     LPITEMIDLIST *dst;
@@ -2334,10 +2334,10 @@
         return NULL;
 
     if (pidl)
-        *pidl = ILClone((LPITEMIDLIST)(&((LPBYTE)cida)[cida->aoffset[0]]));
+        *pidl = ILClone((LPCITEMIDLIST)(&((const BYTE*)cida)[cida->aoffset[0]]));
 
     for (i = 0; i < cida->cidl; i++)
-        dst[i] = ILClone((LPITEMIDLIST)(&((LPBYTE)cida)[cida->aoffset[i + 1]]));
+        dst[i] = ILClone((LPCITEMIDLIST)(&((const BYTE*)cida)[cida->aoffset[i + 1]]));
 
     return dst;
 }
diff -urN a/dlls/shell32/pidl.h b/dlls/shell32/pidl.h
--- a/dlls/shell32/pidl.h	2007-04-11 12:43:26.000000000 +0100
+++ b/dlls/shell32/pidl.h	2007-09-11 23:34:40.000000000 +0100
@@ -275,8 +275,8 @@
  * aPidl helper
  */
 void _ILFreeaPidl(LPITEMIDLIST * apidl, UINT cidl);
-LPITEMIDLIST * _ILCopyaPidl(LPCITEMIDLIST * apidlsrc, UINT cidl);
-LPITEMIDLIST * _ILCopyCidaToaPidl(LPITEMIDLIST* pidl, LPIDA cida);
+LPITEMIDLIST * _ILCopyaPidl(const LPCITEMIDLIST * apidlsrc, UINT cidl);
+LPITEMIDLIST * _ILCopyCidaToaPidl(LPITEMIDLIST* pidl, const CIDA * cida);
 
 BOOL WINAPI ILGetDisplayNameExA(LPSHELLFOLDER psf, LPCITEMIDLIST pidl, LPSTR path, DWORD type);
 BOOL WINAPI ILGetDisplayNameExW(LPSHELLFOLDER psf, LPCITEMIDLIST pidl, LPWSTR path, DWORD type);