[TYPO3-core] RFC: fix bug #3834 protect t3lib_formmail against abuse

[Martin Kutschker]

Hi!

This is a ptach request for trunk and TYPO3-4_1.

Problem: t3lib_formmail could use is_uploaded_file() to prevent an abuse 
with a manipluated $_FILES array.

Solution: check file and log abuse.

Masi
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