foreach() performance improvement backport

Today I backported Marcus' patch from PHP 5.1 back to PHP 4.3.x for inclusion in PHP 4.3.10. This patch improves performance with foreach() where the key of the array element is not interesting (for example foreach($array as $value); ). Benchmarks show that this gives about a performance increase of 4% for eZ publish without using an accelerator. If an accelerator is used, the performance increase will be even larger as this is a pure execution speed patch.

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