shell32/tests: ILFree is not exported on all versions

[Saulius Krasuckas]

Vitaliy, 

I have been messing around shell32/tests some day ago, and stuck upon a 
MSDN, which states that SHGetMalloc() is obsolete.  It says we must should 
stick with CoTaskMemFree() and CoTaskMemAlloc() instead.

Would you take a thought on this?