[python-ldap] more fine-grained GIL releasing in l_ldap_result4()

[Michael Ströder]

HI!

I plan to apply the attached patch to ensure that GIL is only 
released when calling out to libldap and re-claimed immediately 
afterwards.

Please review.

Basically l_ldap_result4() etc. is a real mess and one of the 
deficiencies in python-ldap's code base.

Any comments on that?

Ciao, Michael.
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