Remove redundant *spell* libraries on Alpine (#15890)

These were needed mostly for the PHP <= 8.3 pspell extension. The
nchant2-hunspell gets installed automatically as a dependency with

Remove redundant *spell* libraries on Alpine (#15890)

These were needed mostly for the PHP <= 8.3 pspell extension. The
nchant2-hunspell gets installed automatically as a dependency with
enchant2-dev if needed.

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Remove redundant Kerberos library installation (#15889)

This was once needed for the --with-kerberos configure options by
openssl or imap extensions.

Alpine/Musl nightly job (#13925)



Co-authored-by: Michael Voříšek <mvorisek@mvorisek.cz>