[php84] missing extensions

[Bjarne D Mathiesen]

pspell was evicted from PHP core in version 8.4;

php81-pspell and later subports are now found in the separate php-pspell
Portfile.

    On branch php84

    Changes to be committed:
            modified:   lang/php/Portfile
            new file:   php/php-pspell/Portfile

-- 
Bjarne D Mathiesen
Slagelse ; Danmark ; Europa
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