[mojosetup] Open the log file in append mode.

[Francois Gouget]

My installer invokes some external shell scripts that output their log 
information to the same file as MojoSetup. But without append mode, 
anything MojoSetup writes after invoking the scripts ends up in the 
middle of the file.


-- 
François Gouget
fgouget at codeweavers.com

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