msi: cabinet_notify - don't fail on files with the same filepath

[Stefan Siebert]

This fixes the 'Error 80' bug in the msi implementation (e.g. for the 
notes client) if more than one file gets resolved and extracted to the 
same filepath.
msi allows files from different components (maybe even from the same 
component) to be overwritten be each other - dependent on the file 
sequence.

Changelog: msi/files.c - cabinet_notify - Do not fail if a file has been 
resolved and extracted to the same filepath before

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