bug symfony#212 [Mbstring] fix `mb_str_split()` ignoring new-line cha…

…racters (nicolas-grekas)

This PR was merged into the 1.13-dev branch.

Discussion
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[Mbstring] fix `mb_str_split()` ignoring new-line characters

Closes symfony#211

Commits
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ae1c2e5 [Mbstring] fix `mb_str_split()` ignoring new-line characters

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