mb_parse_str, mb_http_input, and mb_convert_variables use fast text conversion code for automatic encoding detection

For mb_parse_str, when mbstring.http_input (INI parameter) is a list of

mb_parse_str, mb_http_input, and mb_convert_variables use fast text conversion code for automatic encoding detection

For mb_parse_str, when mbstring.http_input (INI parameter) is a list of
multiple possible text encodings (which is not the case by default),
this new implementation is about 25% faster.

When mbstring.http_input is a single value, then nothing is changed.
(No automatic encoding detection is done in that case.)

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