Don't try to remove xcodebuild directory on Windows.

make.py is a python script to be run *only* on Windows and thus
xcodebuild directory should not exist there. If we never create it on Windows,
then why should we try to remove something we don't create there?

R=epoger@google.com

Review URL: https://codereview.chromium.org/299443005

git-svn-id: http://skia.googlecode.com/svn/trunk@14846 2bbb7eff-a529-9590-31e7-b0007b416f81
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