ZF-11903: Some head* placeholders behave oddly with setIndent

Description

Some placeholders in Zend_View_Helper exhibit odd behavior when using setIndent.

Example code (layout.phtml): <?php echo strlen($this->headScript()->setIndent(2)); echo strlen($this->headMeta()->setIndent(2)); echo strlen($this->headLink()->setIndent(2)); ?>

Expected result: 0 0 0

Actual result: 0 2 2

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