[darwinbuild-dev] installXcode3: cannot overwrite directory

[probono]

When you try to "installXcode BuildRoot/" on an existing BuildRoot,
you get many errors like the following one:

cp: cannot overwrite directory
BuildRoot///System/Library/Frameworks/CoreFoundation.framework/Versions/Current
with non-directory
/System/Library/Frameworks/CoreFoundation.framework/Versions/Current

The attached tiny patch for installXcode3 solves that by deleting the
respective frameworks in the BuildRoot first before copying the ones
from the host in. Feel free to apply the patch if you think it's
useful.
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