[TYPO3-core] FYI72 #17663: Remove deprecated reduceColors() from t3lib_stdGraphic

[Christian Kuhn]

Attached patch will be committed to trunk in 72 hours if nobody objects.

Type: cleanup

BT: http://bugs.typo3.org/view.php?id=17663

Problem:
With the removal of gdlib 1 method reduceColors() in t3lib_stdGraphic 
was deprecated. It is scheduled for removal in 4.6.

Solution:
Remove method and calls.

Notes:
Calls to reduceColors() currently depend on 'if (!$this->truecolor)'. 
This internal variable is always true since 4.4 rev. 7781, issue #14441 
(the gdlib 1 support drop). So, it is safe to remove the variable, its 
calls and method reduceColors() now.


Regards
Christian
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