[perl #118951] Inconsistent uppercasing of ß

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<lue> r: say "ß".uc
<camelia> rakudo 45d447: OUTPUT«ß␤»
<lue> r: say "ẞ".lc.uc
<camelia> rakudo 45d447: OUTPUT«SS␤»


Both examples above are meant to result in SS. Note that the capital 
eszett does convert to a lowercase one:

<lue> r: say "ẞ".lc
<camelia> rakudo 45d447: OUTPUT«ß␤»