PHPC-1185: Restore sasl_client_done check
PHPC-1185: Restore sasl_client_done check

The check for sasl_client_done was inadvertently removed by aab92e1d3e2bc1411001d5daa8bc56ab51d0266e. This ensures that we check for the symbol regardless of whether SASL was found with pgk-config or PHP_CHECK_LIBRARY.

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