[TYPO3-core] RFC: Fix bug when comparing version numbers

[Karsten Dambekalns]

Hi.

Type: bugfix
BT ref: n/a
Branch: HEAD, TYPO3_4-0

When installing an extension, often a warning is shown like this:
 The running TYPO3 version (4.0.1) is higher than allowed (0.0.2)

There is already a cleanup in place, but this only acts when the new 
constraints array is not present in ext_emconf.php.

If it is already there, but contains such bogus values the cleanup does not 
happen. The attached patch changes this.

Karsten
-- 
Karsten Dambekalns
TYPO3 Association - Active Member
http://association.typo3.org/
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