refactor: old php support code. #472
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htmlpurifier support PHP 5.6 ~ PHP 8.5
so, below PHP 5.5 removed
remove items:
IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46
support above icu 4.6 version so always support
This constant check statement was added to support PHP 5.3 (icu 3.8 ~ 4.8)