plperl: Package-qualify _TD

Failing to do so causes trigger invocation to fail when they are nested
within a function invocation that changes the current package.

Backpatch to 9.1; previous releases used a different method to obtain
_TD.  Per bug report from Mark Murawski (bug #6511)

Author: Alex Hunsaker

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/814e08e895a037e3f5485000db5964cd68dbfa01

Modified Files
--------------
src/pl/plperl/plperl.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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