stackbuilder - wizard: Fix the MD5 code to work on PPC Macs

Log Message:
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Fix the MD5 code to work on PPC Macs

Modified Files:
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wizard:
MD5.cpp (r1.3 -> r1.4)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/stackbuilder/wizard/MD5.cpp.diff?r1=1.3&r2=1.4)