small refactoring of lazutf8sysutils.pas
Original Reporter info from Mantis: barlone @barloneD
Description:
Changes eliminate some compiler warnings and produce more compact code.
Mantis conversion info:
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Mantis ID: 20657
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Version: 0.9.31 (SVN)
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Fixed in version: 0.9.31 (SVN)
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Fixed in revision: 33437 (#eca7c0b0)