Fixed Bug #67410 fileinfo: mconvert incorrect handling of truncated pascal string size

Upstream
https://github.com/file/file/commit/27a14bc7ba285a0a5ebfdb55e54001aa11932b08
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Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
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  Fixed Bug #67410 fileinfo: mconvert incorrect handling of truncated pascal string size
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Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  NEWS
  NEWS
  Fixed Bug #67410 fileinfo: mconvert incorrect handling of truncated pascal string size
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