gdi32: Fixed a couple of Win64 pointer cast compiler warnings

[Eddie Leung]

Hi all! 

First patch ever.  First attempt at an open source contribution ever.

I( and several others) have gotten involved with wine as part of a 
software engineering course at UCLA.

I attest to not having seen any Microsoft source code and have never 
disassembled any Windows DLLs.

I manually copy-pasted over the diff from my VM into notepad and saved 
as utf-8.  Hope that works out...

-- 
Eddie P. Leung
510.220.8299 | eddie.leung.2009 at anderson.ucla.edu 
<mailto:eddie.leung.2009 at anderson.ucla.edu>
Joint MBA/MS in Computer Science Candidate, Class of 2009
UCLA Anderson School of Management
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