Perl 5.6.0

Hi all,

I've tried to compile interfaces/perl5 with perl-5.6.0.

It fails because the perl symbols sv-undef and na have been renamed to
PL_sv_undef and PL_na;

The obvious trick was to patch Pg.xs.

Surely, Makefile.PL can take care of that and name those two symbols
according to the perl version.

Now, not being a perl expert, I just warn you that you may go into a
problem (and FAQ's) sooner or later..

Regards,

-- 
Olivier PRENANT         	Tel:	+33-5-61-50-97-00 (Work)
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