[check_postgres] Another 7.4 issue

[Giles Westwood]

bloat action creates this error:-

ERROR: ERROR:  unrecognized configuration parameter "block_size"

rather than a 7.4 warning.

-- 
Giles Westwood, Systems Administrator,
Semantico, Floor 1, 21-23 Dyke Road, Brighton BN1 3FE
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