[Dovecot] configure performs checks for not needed sasl headers

[Pascal Volk]

Hi,

I'm always surprised when I see output from configure like
	checking for really_not_needed.h... no
The configure script is always 'checking sasl.h usability' even when the
--without-ldap option was specified.

The attached patch checks the presence of sasl.h / sasl/sasl.h only when
using the --with-ldap option && all required LDAP headers and libs are
available.


Regards,
Pascal
-- 
The trapper recommends today: 5e1f1e55.0920700 at localdomain.org
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