fix invalid codePoint=0x110000 in icu_utf8_char() #6
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The existing code only invalidates code points that are STRICTLY HIGHER than 0x110000; but 0x110000 itself is ALSO invalid.
The last test has reversed the order for test branches using ">" instead of "<" which is correct for all other tests (this could have used ">=", but it is more logical to reorder the branches in ascending order, and make the invalid codes handled in the last "else { }" branch.
This fixes bug #5 .