c-ares / c-ares / #1304

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mem leak due to `ares__hosts_entry_to_hostent()` allocation strategy (#824)

`ares__hosts_entry_to_hostent()` would allocate a separate buffer for
each address, but `ares_free_hostent()` expects a single allocation to
hold all addresses.

This PR fixes this issue and simplifies the logic by using the
already-existing `ares__addrinfo2hostent()` to write the hostent instead
of coming up with yet another way to write the structure.

Fixes #823
Fix By: Brad House (@bradh352)

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