[TYPO3-core] RFC: #11368: ENABLE_INSTALL_TOOL file should be ignored if older than one hour

[Michael Stucki]

Hi Ernesto,

> But call the "unlink" with @ to avoid a warning if it fails, because I
> guess many will simply create the file as "root" (on development
> machines) to avoid it from being deleted by the webserver. :)

I think it's a bad habit and we should stop suppressing warnings. 
Reason: No warning is displayed as long as display_errors is turned off. 
However, if the error is suppressed, also the error_log won't indicate 
any errors.

Prove me wrong but otherwise I'll better keep the unlink call without 
the "@".

- michael
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