Replace strdup() with pstrdup(), to avoid leaking memory.

It's been like this since the seg module was introduced, so backpatch to
8.2 which is the oldest supported version.

Branch
------
REL9_0_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/7541d32e86b739afb41e711a4c790aed446dd0e2

Modified Files
--------------
contrib/seg/seg.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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